diff --git a/libraries/entities-renderer/src/RenderableEntityItem.cpp b/libraries/entities-renderer/src/RenderableEntityItem.cpp
index 0bf2b590c0..212baa6634 100644
--- a/libraries/entities-renderer/src/RenderableEntityItem.cpp
+++ b/libraries/entities-renderer/src/RenderableEntityItem.cpp
@@ -635,6 +635,7 @@ void EntityRenderer::updateShapeKeyBuilderFromMaterials(ShapeKey::Builder& build
     {
         std::lock_guard<std::mutex> lock(_materialsLock);
         materials = _materials.find("0");
+
         if (materials != _materials.end()) {
             if (materials->second.shouldUpdate()) {
                 RenderPipelines::updateMultiMaterial(materials->second);
@@ -662,7 +663,6 @@ void EntityRenderer::updateShapeKeyBuilderFromMaterials(ShapeKey::Builder& build
     auto pipelineType = getPipelineType(materials->second);
     if (pipelineType == Pipeline::MATERIAL) {
         builder.withMaterial();
-
         if (drawMaterialKey.isNormalMap()) {
             builder.withTangents();
         }
diff --git a/libraries/entities-renderer/src/RenderableImageEntityItem.cpp b/libraries/entities-renderer/src/RenderableImageEntityItem.cpp
index 3fa2174114..9592a3e57f 100644
--- a/libraries/entities-renderer/src/RenderableImageEntityItem.cpp
+++ b/libraries/entities-renderer/src/RenderableImageEntityItem.cpp
@@ -198,10 +198,8 @@ void ImageEntityRenderer::doRender(RenderArgs* args) {
         procedural->prepare(*batch, transform.getTranslation(), transform.getScale(), transform.getRotation(), _created, ProceduralProgramKey(transparent));
     } else if (pipelineType == Pipeline::SIMPLE) {
         batch->setResourceTexture(0, _texture->getGPUTexture());
-    } else {
-        if (RenderPipelines::bindMaterials(materials, *batch, args->_renderMode, args->_enableTexturing)) {
-            args->_details._materialSwitches++;
-        }
+    } else if (RenderPipelines::bindMaterials(materials, *batch, args->_renderMode, args->_enableTexturing)) {
+        args->_details._materialSwitches++;
     }
 
     DependencyManager::get<GeometryCache>()->renderQuad(
diff --git a/libraries/entities/src/EntityItemProperties.cpp b/libraries/entities/src/EntityItemProperties.cpp
index ed396f88c9..fe4c960bd6 100644
--- a/libraries/entities/src/EntityItemProperties.cpp
+++ b/libraries/entities/src/EntityItemProperties.cpp
@@ -954,7 +954,7 @@ EntityPropertyFlags EntityItemProperties::getChangedProperties() const {
  * @property {string} materialURL="" - URL to a {@link Entities.MaterialResource|MaterialResource}. Alternatively, set the
  *     property value to <code>"materialData"</code> to use the <code>materialData</code> property for the
  *     {@link Entities.MaterialResource|MaterialResource} values. If you append <code>"#name"</code> to the URL, the material
- *     with that name will be applied to the entity. You can also use the ID of another material entity as the URL, in which
+ *     with that name will be applied to the entity. You can also use the ID of another Material entity as the URL, in which
  *     case this material will act as a copy of that material, with its own unique material transform, priority, etc.
  * @property {string} materialData="" - Used to store {@link Entities.MaterialResource|MaterialResource} data as a JSON string.
  *     You can use <code>JSON.parse()</code> to parse the string into a JavaScript object which you can manipulate the
@@ -1380,7 +1380,8 @@ EntityPropertyFlags EntityItemProperties::getChangedProperties() const {
 /*@jsdoc
  * The <code>"Web"</code> {@link Entities.EntityType|EntityType} displays a browsable web page. Each user views their own copy
  * of the web page: if one user navigates to another page on the entity, other users do not see the change; if a video is being
- * played, users don't see it in sync. It has properties in addition to the common
+ * played, users don't see it in sync. Internally, a Web Entity is rendered as a non-repeating, upside down texture, so additional
+ * transformations may be necessary if you reference a web entity texture by UUID. It has properties in addition to the common
  * {@link Entities.EntityProperties|EntityProperties}.
  *
  * @typedef {object} Entities.EntityProperties-Web
diff --git a/libraries/gpu/src/gpu/Texture.cpp b/libraries/gpu/src/gpu/Texture.cpp
index 099d6dc0d8..48159c5da5 100755
--- a/libraries/gpu/src/gpu/Texture.cpp
+++ b/libraries/gpu/src/gpu/Texture.cpp
@@ -898,8 +898,11 @@ void SphericalHarmonics::evalFromTexture(const Texture& texture, gpu::BackendTar
 
 // TextureSource
 const gpu::TexturePointer TextureSource::getGPUTexture() const {
-    if (_gpuTextureOperator) {
-        return _gpuTextureOperator();
+    if (_gpuTextureOperator && !_locked) {
+        _locked = true;
+        auto gpuTexture = _gpuTextureOperator();
+        _locked = false;
+        return gpuTexture;
     }
     return _gpuTexture;
 }
@@ -915,8 +918,10 @@ void TextureSource::resetTextureOperator(const std::function<gpu::TexturePointer
 }
 
 bool TextureSource::isDefined() const {
-    if (_gpuTextureOperator) {
+    if (_gpuTextureOperator && !_locked) {
+        _locked = true;
         auto gpuTexture = _gpuTextureOperator();
+        _locked = false;
         return gpuTexture && gpuTexture->isDefined();
     }
     return _gpuTexture && _gpuTexture->isDefined();
diff --git a/libraries/gpu/src/gpu/Texture.h b/libraries/gpu/src/gpu/Texture.h
index 12896aca7b..a0cfc60b6e 100755
--- a/libraries/gpu/src/gpu/Texture.h
+++ b/libraries/gpu/src/gpu/Texture.h
@@ -727,6 +727,7 @@ public:
 protected:
     gpu::TexturePointer _gpuTexture;
     std::function<gpu::TexturePointer()> _gpuTextureOperator { nullptr };
+    mutable bool _locked { false };
     QUrl _imageUrl;
     int _type { 0 };
 };
diff --git a/libraries/graphics/src/graphics/Material.h b/libraries/graphics/src/graphics/Material.h
index 3abcb8b4c0..2eb4e0cbe1 100755
--- a/libraries/graphics/src/graphics/Material.h
+++ b/libraries/graphics/src/graphics/Material.h
@@ -341,7 +341,7 @@ public:
     virtual ~Material() = default;
     Material& operator= (const Material& material);
 
-    virtual const MaterialKey& getKey() const { return _key; }
+    virtual MaterialKey getKey() const { return _key; }
 
     static const float DEFAULT_EMISSIVE;
     void setEmissive(const glm::vec3& emissive, bool isSRGB = true);
@@ -385,7 +385,7 @@ public:
     // The texture map to channel association
     static const int NUM_TEXCOORD_TRANSFORMS { 2 };
     void setTextureMap(MapChannel channel, const TextureMapPointer& textureMap);
-    virtual const TextureMaps& getTextureMaps() const { return _textureMaps; } // FIXME - not thread safe...
+    virtual TextureMaps getTextureMaps() const { return _textureMaps; } // FIXME - not thread safe...
     const TextureMapPointer getTextureMap(MapChannel channel) const;
 
     // Albedo maps cannot have opacity detected until they are loaded
diff --git a/libraries/material-networking/src/material-networking/TextureCache.cpp b/libraries/material-networking/src/material-networking/TextureCache.cpp
index 8c44379dd5..489692e3e2 100644
--- a/libraries/material-networking/src/material-networking/TextureCache.cpp
+++ b/libraries/material-networking/src/material-networking/TextureCache.cpp
@@ -1402,4 +1402,9 @@ std::function<gpu::TexturePointer()> Texture::getTextureForUUIDOperator(const QU
         return std::bind(_unboundTextureForUUIDOperator, uuid);
     }
     return nullptr;
-}
\ No newline at end of file
+}
+
+
+void Texture::setUnboundTextureForUUIDOperator(std::function<gpu::TexturePointer(const QUuid&)> textureForUUIDOperator) {
+    _unboundTextureForUUIDOperator = textureForUUIDOperator;
+}
diff --git a/libraries/material-networking/src/material-networking/TextureCache.h b/libraries/material-networking/src/material-networking/TextureCache.h
index 069c5d15f5..c0633c2f9b 100644
--- a/libraries/material-networking/src/material-networking/TextureCache.h
+++ b/libraries/material-networking/src/material-networking/TextureCache.h
@@ -41,7 +41,7 @@ public:
     gpu::TextureSourcePointer _textureSource;
 
     static std::function<gpu::TexturePointer()> getTextureForUUIDOperator(const QUuid& uuid);
-    static void setUnboundTextureForUUIDOperator(std::function<gpu::TexturePointer(const QUuid&)> textureForUUIDOperator) { _unboundTextureForUUIDOperator = textureForUUIDOperator; }
+    static void setUnboundTextureForUUIDOperator(std::function<gpu::TexturePointer(const QUuid&)> textureForUUIDOperator);
 
 private:
     static std::function<gpu::TexturePointer(const QUuid&)> _unboundTextureForUUIDOperator;
diff --git a/libraries/procedural/src/procedural/Procedural.h b/libraries/procedural/src/procedural/Procedural.h
index 3b50a34fa0..d6971e3cdf 100644
--- a/libraries/procedural/src/procedural/Procedural.h
+++ b/libraries/procedural/src/procedural/Procedural.h
@@ -40,7 +40,7 @@ const size_t MAX_PROCEDURAL_TEXTURE_CHANNELS{ 4 };
  *     If a procedural material contains a vertex shader, the bounding box of the material entity is used to cull the object to which the material is applied.
  * @property {string} fragmentShaderURL - A link to a fragment shader.  Currently, only GLSL shaders are supported.  The shader must implement a different method depending on the version.
  *     <code>shaderUrl</code> is an alias.
- * @property {string[]} channels=[] - An array of input texture URLs or entity IDs.  Currently, up to 4 are supported.
+ * @property {string[]} channels=[] - An array of input texture URLs or entity IDs.  Currently, up to 4 are supported.  An entity ID may be that of an Image or a Web entity.
  * @property {ProceduralUniforms} uniforms={} - A {@link ProceduralUniforms} object containing all the custom uniforms to be passed to the shader.
  */
 
diff --git a/libraries/procedural/src/procedural/ReferenceMaterial.cpp b/libraries/procedural/src/procedural/ReferenceMaterial.cpp
index a926c1f5ce..97211eb737 100644
--- a/libraries/procedural/src/procedural/ReferenceMaterial.cpp
+++ b/libraries/procedural/src/procedural/ReferenceMaterial.cpp
@@ -18,157 +18,216 @@ ReferenceMaterial::ReferenceMaterial(QUuid uuid) :
 }
 
 // Material
-const graphics::MaterialKey& ReferenceMaterial::getKey() const {
-    auto material = getMaterial();
-    return material ? material->getKey() : Parent::getKey();
+graphics::MaterialKey ReferenceMaterial::getKey() const {
+    return resultWithLock<graphics::MaterialKey>([&] {
+        auto material = getMaterial();
+        return material ? material->getKey() : Parent::getKey();
+    });
 }
 
 glm::vec3 ReferenceMaterial::getEmissive(bool SRGB) const {
-    auto material = getMaterial();
-    return material ? material->getEmissive(SRGB) : glm::vec3(DEFAULT_EMISSIVE);
+    return resultWithLock<glm::vec3>([&] {
+        auto material = getMaterial();
+        return material ? material->getEmissive(SRGB) : glm::vec3(DEFAULT_EMISSIVE);
+    });
 }
 
 float ReferenceMaterial::getOpacity() const {
-    auto material = getMaterial();
-    return material ? material->getOpacity() : DEFAULT_OPACITY;
+    return resultWithLock<float>([&] {
+        auto material = getMaterial();
+        return material ? material->getOpacity() : DEFAULT_OPACITY;
+    });
 }
 
 graphics::MaterialKey::OpacityMapMode ReferenceMaterial::getOpacityMapMode() const {
-    auto material = getMaterial();
-    return material ? material->getOpacityMapMode() : DEFAULT_OPACITY_MAP_MODE;
+    return resultWithLock<graphics::MaterialKey::OpacityMapMode>([&] {
+        auto material = getMaterial();
+        return material ? material->getOpacityMapMode() : DEFAULT_OPACITY_MAP_MODE;
+    });
 }
 
 float ReferenceMaterial::getOpacityCutoff() const {
-    auto material = getMaterial();
-    return material ? material->getOpacityCutoff() : DEFAULT_OPACITY_CUTOFF;
+    return resultWithLock<float>([&] {
+        auto material = getMaterial();
+        return material ? material->getOpacityCutoff() : DEFAULT_OPACITY_CUTOFF;
+    });
 }
 
 graphics::MaterialKey::CullFaceMode ReferenceMaterial::getCullFaceMode() const {
-    auto material = getMaterial();
-    return material ? material->getCullFaceMode() : DEFAULT_CULL_FACE_MODE;
+    return resultWithLock<graphics::MaterialKey::CullFaceMode>([&] {
+        auto material = getMaterial();
+        return material ? material->getCullFaceMode() : DEFAULT_CULL_FACE_MODE;
+    });
 }
 
 bool ReferenceMaterial::isUnlit() const {
-    auto material = getMaterial();
-    return material ? material->isUnlit() : false;
+    return resultWithLock<bool>([&] {
+        auto material = getMaterial();
+        return material ? material->isUnlit() : false;
+    });
 }
 
 glm::vec3 ReferenceMaterial::getAlbedo(bool SRGB) const {
-    auto material = getMaterial();
-    return material ? material->getAlbedo(SRGB) : glm::vec3(DEFAULT_ALBEDO);
+    return resultWithLock<glm::vec3>([&] {
+        auto material = getMaterial();
+        return material ? material->getAlbedo(SRGB) : glm::vec3(DEFAULT_ALBEDO);
+    });
 }
 
 float ReferenceMaterial::getMetallic() const {
-    auto material = getMaterial();
-    return material ? material->getMetallic() : DEFAULT_METALLIC;
+    return resultWithLock<float>([&] {
+        auto material = getMaterial();
+        return material ? material->getMetallic() : DEFAULT_METALLIC;
+    });
 }
 
 float ReferenceMaterial::getRoughness() const {
-    auto material = getMaterial();
-    return material ? material->getRoughness() : DEFAULT_ROUGHNESS;
+    return resultWithLock<float>([&] {
+        auto material = getMaterial();
+        return material ? material->getRoughness() : DEFAULT_ROUGHNESS;
+    });
 }
 
 float ReferenceMaterial::getScattering() const {
-    auto material = getMaterial();
-    return material ? material->getScattering() : DEFAULT_SCATTERING;
+    return resultWithLock<float>([&] {
+        auto material = getMaterial();
+        return material ? material->getScattering() : DEFAULT_SCATTERING;
+    });
 }
 
 bool ReferenceMaterial::resetOpacityMap() const {
-    auto material = getMaterial();
-    return material ? material->resetOpacityMap() : false;
+    return resultWithLock<bool>([&] {
+        auto material = getMaterial();
+        return material ? material->resetOpacityMap() : false;
+    });
 }
 
-const graphics::Material::TextureMaps& ReferenceMaterial::getTextureMaps() const {
-    auto material = getMaterial();
-    return material ? material->getTextureMaps() : Parent::getTextureMaps();
-}
+graphics::Material::TextureMaps ReferenceMaterial::getTextureMaps() const {
+    return resultWithLock<graphics::Material::TextureMaps>([&] {
+        auto material = getMaterial();
+        return material ? material->getTextureMaps() : Parent::getTextureMaps();
+    });
+} 
 
 glm::vec2 ReferenceMaterial::getLightmapParams() const {
-    auto material = getMaterial();
-    return material ? material->getLightmapParams() : glm::vec2(0.0f, 1.0f);
+    return resultWithLock<glm::vec2>([&] {
+        auto material = getMaterial();
+        return material ? material->getLightmapParams() : glm::vec2(0.0f, 1.0f);
+    });
 }
 
 bool ReferenceMaterial::getDefaultFallthrough() const {
-    auto material = getMaterial();
-    return material ? material->getDefaultFallthrough() : false;
+    return resultWithLock<bool>([&] {
+        auto material = getMaterial();
+        return material ? material->getDefaultFallthrough() : false;
+    });
 }
 
 // NetworkMaterial
 bool ReferenceMaterial::isMissingTexture() {
-    auto material = getNetworkMaterial();
-    return material ? material->isMissingTexture() : false;
+    return resultWithLock<bool>([&] {
+        auto material = getNetworkMaterial();
+        return material ? material->isMissingTexture() : false;
+    });
 }
 
 bool ReferenceMaterial::checkResetOpacityMap() {
-    auto material = getNetworkMaterial();
-    return material ? material->checkResetOpacityMap() : false;
+    return resultWithLock<bool>([&] {
+        auto material = getNetworkMaterial();
+        return material ? material->checkResetOpacityMap() : false;
+    });
 }
 
 // ProceduralMaterial
 bool ReferenceMaterial::isProcedural() const {
-    auto material = getMaterial();
-    return material ? material->isProcedural() : false;
+    return resultWithLock<bool>([&] {
+        auto material = getMaterial();
+        return material ? material->isProcedural() : false;
+    });
 }
 
 bool ReferenceMaterial::isEnabled() const {
-    auto material = getMaterial();
-    return material ? material->isEnabled() : false;
+    return resultWithLock<bool>([&] {
+        auto material = getMaterial();
+        return material ? material->isEnabled() : false;
+    });
 }
 
 bool ReferenceMaterial::isReady() const {
-    auto material = getMaterial();
-    return material ? material->isReady() : false;
+    return resultWithLock<bool>([&] {
+        auto material = getMaterial();
+        return material ? material->isReady() : false;
+    });
 }
 
 QString ReferenceMaterial::getProceduralString() const {
-    auto material = getMaterial();
-    return material ? material->getProceduralString() : QString();
+    return resultWithLock<QString>([&] {
+        auto material = getMaterial();
+        return material ? material->getProceduralString() : QString();
+    });
 }
 
 glm::vec4 ReferenceMaterial::getColor(const glm::vec4& color) const {
-    auto material = getProceduralMaterial();
-    return material ? material->getColor(color) : glm::vec4();
+    return resultWithLock<glm::vec4>([&] {
+        auto material = getProceduralMaterial();
+        return material ? material->getColor(color) : glm::vec4();
+    });
 }
 
 bool ReferenceMaterial::isFading() const {
-    auto material = getProceduralMaterial();
-    return material ? material->isFading() : false;
+    return resultWithLock<bool>([&] {
+        auto material = getProceduralMaterial();
+        return material ? material->isFading() : false;
+    });
 }
 
 uint64_t ReferenceMaterial::getFadeStartTime() const {
-    auto material = getProceduralMaterial();
-    return material ? material->getFadeStartTime() : 0;
+    return resultWithLock<uint64_t>([&] {
+        auto material = getProceduralMaterial();
+        return material ? material->getFadeStartTime() : 0;
+    });
 }
 
 bool ReferenceMaterial::hasVertexShader() const {
-    auto material = getProceduralMaterial();
-    return material ? material->hasVertexShader() : false;
+    return resultWithLock<bool>([&] {
+        auto material = getProceduralMaterial();
+        return material ? material->hasVertexShader() : false;
+    });
 }
 
 void ReferenceMaterial::prepare(gpu::Batch& batch, const glm::vec3& position, const glm::vec3& size, const glm::quat& orientation,
-                const uint64_t& created, const ProceduralProgramKey key) {
-    if (auto material = getProceduralMaterial()) {
-        material->prepare(batch, position, size, orientation, created, key);
-    }
+                                const uint64_t& created, const ProceduralProgramKey key) {
+    withLock([&] {
+        if (auto material = getProceduralMaterial()) {
+            material->prepare(batch, position, size, orientation, created, key);
+        }
+    });
 }
 
 void ReferenceMaterial::initializeProcedural() {
-    if (auto material = getProceduralMaterial()) {
-        material->initializeProcedural();
-    }
+    withLock([&] {
+        if (auto material = getProceduralMaterial()) {
+            material->initializeProcedural();
+        }
+    });
+}
+
+void ReferenceMaterial::setMaterialForUUIDOperator(std::function<graphics::MaterialPointer(QUuid)> materialForUUIDOperator) {
+    _unboundMaterialForUUIDOperator = materialForUUIDOperator;
 }
 
 graphics::MaterialPointer ReferenceMaterial::getMaterial() const {
     if (_materialForUUIDOperator) {
-        return _materialForUUIDOperator();
+        auto material = _materialForUUIDOperator();
+        return material;
     }
     return nullptr;
 }
 
 std::shared_ptr<NetworkMaterial> ReferenceMaterial::getNetworkMaterial() const {
     if (_materialForUUIDOperator) {
-        auto material = _materialForUUIDOperator();
-        if (material && material->isProcedural()) {
+        std::shared_ptr<NetworkMaterial> result = nullptr;
+        if (auto material = _materialForUUIDOperator()) {
             return std::static_pointer_cast<NetworkMaterial>(material);
         }
     }
@@ -184,3 +243,24 @@ graphics::ProceduralMaterialPointer ReferenceMaterial::getProceduralMaterial() c
     }
     return nullptr;
 }
+
+template <typename T, typename F>
+inline T ReferenceMaterial::resultWithLock(F&& f) const {
+    if (_locked) {
+        return T();
+    } else {
+        _locked = true;
+        T result = f();
+        _locked = false;
+        return result;
+    }
+}
+
+template <typename F>
+inline void ReferenceMaterial::withLock(F&& f) const {
+    if (!_locked) {
+        _locked = true;
+        f();
+        _locked = false;
+    }
+}
diff --git a/libraries/procedural/src/procedural/ReferenceMaterial.h b/libraries/procedural/src/procedural/ReferenceMaterial.h
index 393ef10816..ac778f94b1 100644
--- a/libraries/procedural/src/procedural/ReferenceMaterial.h
+++ b/libraries/procedural/src/procedural/ReferenceMaterial.h
@@ -18,7 +18,7 @@ public:
     ReferenceMaterial(QUuid uuid);
 
     // Material
-    const graphics::MaterialKey& getKey() const override;
+    graphics::MaterialKey getKey() const override;
     glm::vec3 getEmissive(bool SRGB = true) const override;
     float getOpacity() const override;
     graphics::MaterialKey::OpacityMapMode getOpacityMapMode() const override;
@@ -30,10 +30,8 @@ public:
     float getRoughness() const override;
     float getScattering() const override;
     bool resetOpacityMap() const override;
-    const graphics::Material::TextureMaps& getTextureMaps() const override;
-    //glm::mat4 getTexCoordTransform(uint i) const override; // use my actual transform, instead of the original
+    graphics::Material::TextureMaps getTextureMaps() const override;
     glm::vec2 getLightmapParams() const override;
-    //glm::vec2 getMaterialParams() const override; // use my actual params, instead of the original
     bool getDefaultFallthrough() const override;
 
     // NetworkMaterial
@@ -57,13 +55,20 @@ public:
     bool isReference() const override { return true; }
     std::function<graphics::MaterialPointer()> getReferenceOperator() const { return _materialForUUIDOperator; }
 
-    static void setMaterialForUUIDOperator(std::function<graphics::MaterialPointer(QUuid)> materialForUUIDOperator) { _unboundMaterialForUUIDOperator = materialForUUIDOperator; }
+    static void setMaterialForUUIDOperator(std::function<graphics::MaterialPointer(QUuid)> materialForUUIDOperator);
 
 private:
     static std::function<graphics::MaterialPointer(QUuid)> _unboundMaterialForUUIDOperator;
     std::function<graphics::MaterialPointer()> _materialForUUIDOperator;
+    mutable bool _locked { false };
 
     graphics::MaterialPointer getMaterial() const;
     std::shared_ptr<NetworkMaterial> getNetworkMaterial() const;
     graphics::ProceduralMaterialPointer getProceduralMaterial() const;
+
+    template <typename T, typename F>
+    T resultWithLock(F&& f) const;
+
+    template <typename F>
+    void withLock(F&& f) const;
 };
diff --git a/libraries/render-utils/src/RenderPipelines.cpp b/libraries/render-utils/src/RenderPipelines.cpp
index 3e760b2110..ed9fb326c4 100644
--- a/libraries/render-utils/src/RenderPipelines.cpp
+++ b/libraries/render-utils/src/RenderPipelines.cpp
@@ -415,8 +415,8 @@ void RenderPipelines::updateMultiMaterial(graphics::MultiMaterial& multiMaterial
         }
 
         bool defaultFallthrough = material->getDefaultFallthrough();
-        const auto& materialKey = material->getKey();
-        const auto& textureMaps = material->getTextureMaps();
+        const auto materialKey = material->getKey();
+        const auto textureMaps = material->getTextureMaps();
 
         auto it = flagsToCheck.begin();
         while (it != flagsToCheck.end()) {