diff --git a/Engine/source/gfx/gl/gfxGLCircularVolatileBuffer.h b/Engine/source/gfx/gl/gfxGLCircularVolatileBuffer.h
index c291cb229..6d7d0e4b1 100644
--- a/Engine/source/gfx/gl/gfxGLCircularVolatileBuffer.h
+++ b/Engine/source/gfx/gl/gfxGLCircularVolatileBuffer.h
@@ -143,6 +143,11 @@ public:
       init();
    }
 
+   ~GLCircularVolatileBuffer()
+   {
+      glDeleteBuffers(1, &mBufferName);
+   }
+
    void init()
    {
       glGenBuffers(1, &mBufferName);
@@ -290,4 +295,4 @@ protected:
 };
 
 
-#endif
\ No newline at end of file
+#endif
diff --git a/Engine/source/gfx/gl/gfxGLTextureTarget.cpp b/Engine/source/gfx/gl/gfxGLTextureTarget.cpp
index 1569b9a85..ddb308adc 100644
--- a/Engine/source/gfx/gl/gfxGLTextureTarget.cpp
+++ b/Engine/source/gfx/gl/gfxGLTextureTarget.cpp
@@ -260,7 +260,10 @@ GFXGLTextureTarget::GFXGLTextureTarget() : mCopyFboSrc(0), mCopyFboDst(0)
 
 GFXGLTextureTarget::~GFXGLTextureTarget()
 {
-   GFXTextureManager::removeEventDelegate( this, &GFXGLTextureTarget::_onTextureEvent );
+   GFXTextureManager::removeEventDelegate(this, &GFXGLTextureTarget::_onTextureEvent);
+
+   glDeleteFramebuffers(1, &mCopyFboSrc);
+   glDeleteFramebuffers(1, &mCopyFboDst);
 }
 
 const Point2I GFXGLTextureTarget::getSize()
diff --git a/Engine/source/gfx/gl/gfxGLWindowTarget.cpp b/Engine/source/gfx/gl/gfxGLWindowTarget.cpp
index c02ff1bc3..c00506835 100644
--- a/Engine/source/gfx/gl/gfxGLWindowTarget.cpp
+++ b/Engine/source/gfx/gl/gfxGLWindowTarget.cpp
@@ -42,6 +42,14 @@ GFXGLWindowTarget::GFXGLWindowTarget(PlatformWindow *win, GFXDevice *d)
    win->appEvent.notify(this, &GFXGLWindowTarget::_onAppSignal);
 }
 
+GFXGLWindowTarget::~GFXGLWindowTarget()
+{
+   if(glIsFramebuffer(mCopyFBO))
+   {
+      glDeleteFramebuffers(1, &mCopyFBO);
+   }
+}
+
 void GFXGLWindowTarget::resetMode()
 {
    if(mWindow->getVideoMode().fullScreen != mWindow->isFullscreen())
diff --git a/Engine/source/gfx/gl/gfxGLWindowTarget.h b/Engine/source/gfx/gl/gfxGLWindowTarget.h
index 4baa6a53f..af368e192 100644
--- a/Engine/source/gfx/gl/gfxGLWindowTarget.h
+++ b/Engine/source/gfx/gl/gfxGLWindowTarget.h
@@ -30,6 +30,8 @@ class GFXGLWindowTarget : public GFXWindowTarget
 public:
 
    GFXGLWindowTarget(PlatformWindow *win, GFXDevice *d);
+   ~GFXGLWindowTarget();
+
    const Point2I getSize() 
    { 
       return mWindow->getClientExtent();
@@ -64,4 +66,4 @@ private:
    void _WindowPresent();
 };
 
-#endif
\ No newline at end of file
+#endif
diff --git a/Engine/source/lighting/advanced/advancedLightBinManager.cpp b/Engine/source/lighting/advanced/advancedLightBinManager.cpp
index dd71afeb0..98330a5de 100644
--- a/Engine/source/lighting/advanced/advancedLightBinManager.cpp
+++ b/Engine/source/lighting/advanced/advancedLightBinManager.cpp
@@ -318,6 +318,8 @@ void AdvancedLightBinManager::render( SceneRenderState *state )
       const U32 numPrims = curEntry.numPrims;
       const U32 numVerts = curEntry.vertBuffer->mNumVerts;
 
+      ShadowMapParams *lsp = curLightInfo->getExtended<ShadowMapParams>();
+
       // Skip lights which won't affect the scene.
       if ( !curLightMat || curLightInfo->getBrightness() <= 0.001f )
          continue;
@@ -329,15 +331,12 @@ void AdvancedLightBinManager::render( SceneRenderState *state )
       mShadowManager->setLightShadowMap( curEntry.shadowMap );
       mShadowManager->setLightDynamicShadowMap( curEntry.dynamicShadowMap );
 
-      // Let the shadow know we're about to render from it.
-      if ( curEntry.shadowMap )
-         curEntry.shadowMap->preLightRender();
-      if ( curEntry.dynamicShadowMap ) curEntry.dynamicShadowMap->preLightRender();
-
       // Set geometry
       GFX->setVertexBuffer( curEntry.vertBuffer );
       GFX->setPrimitiveBuffer( curEntry.primBuffer );
 
+      lsp->getOcclusionQuery()->begin();
+
       // Render the material passes
       while( curLightMat->matInstance->setupPass( state, sgData ) )
       {
@@ -352,10 +351,7 @@ void AdvancedLightBinManager::render( SceneRenderState *state )
             GFX->drawPrimitive(GFXTriangleList, 0, numPrims);
       }
 
-      // Tell it we're done rendering.
-      if ( curEntry.shadowMap )
-         curEntry.shadowMap->postLightRender();
-      if ( curEntry.dynamicShadowMap ) curEntry.dynamicShadowMap->postLightRender();
+      lsp->getOcclusionQuery()->end();
    }
 
    // Set NULL for active shadow map (so nothing gets confused)
diff --git a/Engine/source/lighting/shadowMap/lightShadowMap.cpp b/Engine/source/lighting/shadowMap/lightShadowMap.cpp
index 53a6f4e8d..984f6cbc6 100644
--- a/Engine/source/lighting/shadowMap/lightShadowMap.cpp
+++ b/Engine/source/lighting/shadowMap/lightShadowMap.cpp
@@ -89,8 +89,6 @@ LightShadowMap::LightShadowMap( LightInfo *light )
       mLastUpdate( 0 ),
       mLastCull( 0 ),
       mIsViewDependent( false ),
-      mVizQuery( NULL ),
-      mWasOccluded( false ),
       mLastScreenSize( 0.0f ),
       mLastPriority( 0.0f ),
       mIsDynamic( false )
@@ -98,9 +96,7 @@ LightShadowMap::LightShadowMap( LightInfo *light )
    GFXTextureManager::addEventDelegate( this, &LightShadowMap::_onTextureEvent );
 
    mTarget = GFX->allocRenderToTextureTarget();
-   mVizQuery = GFX->createOcclusionQuery();
-
-   smShadowMaps.push_back(this);
+   smShadowMaps.push_back( this );
    mStaticRefreshTimer = PlatformTimer::create();
    mDynamicRefreshTimer = PlatformTimer::create();
 }
@@ -108,8 +104,9 @@ LightShadowMap::LightShadowMap( LightInfo *light )
 LightShadowMap::~LightShadowMap()
 {
    mTarget = NULL;
-   SAFE_DELETE( mVizQuery );   
-   
+   SAFE_DELETE(mStaticRefreshTimer);
+   SAFE_DELETE(mDynamicRefreshTimer);
+
    releaseTextures();
 
    smShadowMaps.remove( this );
@@ -334,23 +331,6 @@ void LightShadowMap::render(  RenderPassManager* renderPass,
    mLastUpdate = Sim::getCurrentTime();
 }
 
-void LightShadowMap::preLightRender()
-{
-   PROFILE_SCOPE( LightShadowMap_prepLightRender );
-
-   if ( mVizQuery )
-   {
-      mWasOccluded = mVizQuery->getStatus( true ) == GFXOcclusionQuery::Occluded;
-      mVizQuery->begin();
-   }
-}
-
-void LightShadowMap::postLightRender()
-{
-   if ( mVizQuery )
-      mVizQuery->end();
-}
-
 BaseMatInstance* LightShadowMap::getShadowMaterial( BaseMatInstance *inMat ) const
 {
    // See if we have an existing material hook.
@@ -610,11 +590,14 @@ ShadowMapParams::ShadowMapParams( LightInfo *light )
    shadowSoftness = 0.15f;
    fadeStartDist = 0.0f;
    lastSplitTerrainOnly = false;
+   mQuery = GFX->createOcclusionQuery();
+
    _validate();
 }
 
 ShadowMapParams::~ShadowMapParams()
 {
+   SAFE_DELETE( mQuery );
    SAFE_DELETE( mShadowMap );
    SAFE_DELETE( mDynamicShadowMap );
 }
diff --git a/Engine/source/lighting/shadowMap/lightShadowMap.h b/Engine/source/lighting/shadowMap/lightShadowMap.h
index 2cbb2ca5e..d96481192 100644
--- a/Engine/source/lighting/shadowMap/lightShadowMap.h
+++ b/Engine/source/lighting/shadowMap/lightShadowMap.h
@@ -47,6 +47,9 @@
 #ifndef _GFXSHADER_H_
 #include "gfx/gfxShader.h"
 #endif
+#ifndef _GFXOCCLUSIONQUERY_H_
+#include "gfx/gfxOcclusionQuery.h"
+#endif
 #ifndef _PLATFORM_PLATFORMTIMER_H_
 #include "platform/platformTimer.h"
 #endif
@@ -61,7 +64,6 @@ struct SceneData;
 class GFXShaderConstBuffer;
 class GFXShaderConstHandle;
 class GFXShader;
-class GFXOcclusionQuery;
 class LightManager;
 class RenderPassManager;
 
@@ -169,12 +171,6 @@ public:
 
    bool isViewDependent() const { return mIsViewDependent; }
 
-   bool wasOccluded() const { return mWasOccluded; }
-
-   void preLightRender();
-
-   void postLightRender();
-
    void updatePriority( const SceneRenderState *state, U32 currTimeMs );
 
    F32 getLastScreenSize() const { return mLastScreenSize; }
@@ -257,15 +253,6 @@ protected:
    /// The time this shadow was last culled and prioritized.
    U32 mLastCull;
 
-   /// The shadow occlusion query used when the light is
-   /// rendered to determine if any pixel of it is visible.
-   GFXOcclusionQuery *mVizQuery;
-
-   /// If true the light was occluded by geometry the
-   /// last frame it was updated.
-   //the last frame.
-   bool mWasOccluded;
-
    F32 mLastScreenSize;
 
    F32 mLastPriority;
@@ -325,6 +312,8 @@ public:
 
    bool hasCookieTex() const { return cookie.isNotEmpty(); }
 
+   GFXOcclusionQuery* getOcclusionQuery() const { return mQuery; }
+
    GFXTextureObject* getCookieTex();
 
    GFXCubemap* getCookieCubeTex();
@@ -339,6 +328,7 @@ protected:
    ///
    LightShadowMap *mShadowMap;
    LightShadowMap *mDynamicShadowMap;
+   GFXOcclusionQuery* mQuery;
 
    LightInfo *mLight;
 
diff --git a/Engine/source/lighting/shadowMap/shadowMapPass.cpp b/Engine/source/lighting/shadowMap/shadowMapPass.cpp
index 7c17046e1..dea7305b5 100644
--- a/Engine/source/lighting/shadowMap/shadowMapPass.cpp
+++ b/Engine/source/lighting/shadowMap/shadowMapPass.cpp
@@ -174,12 +174,12 @@ void ShadowMapPass::render(   SceneManager *sceneManager,
          continue;
       
       // --- Static Shadow Map ---
-	  LightShadowMap *lsm = params->getOrCreateShadowMap();
-     LightShadowMap *dlsm = params->getOrCreateShadowMap(true);
+      LightShadowMap *lsm = params->getOrCreateShadowMap();
+      LightShadowMap *dlsm = params->getOrCreateShadowMap(true);
 
       // First check the visiblity query... if it wasn't 
       // visible skip it.
-     if (lsm->wasOccluded() || dlsm->wasOccluded())
+      if(params->getOcclusionQuery()->getStatus(true) == GFXOcclusionQuery::Occluded)
          continue;
 
       // Any shadow that is visible is counted as being 
@@ -187,9 +187,9 @@ void ShadowMapPass::render(   SceneManager *sceneManager,
       ++smActiveShadowMaps;
 
       // Do a priority update for this shadow.
-	  lsm->updatePriority(diffuseState, currTime);
+      lsm->updatePriority(diffuseState, currTime);
 
-	  shadowMaps.push_back(lsm);
+      shadowMaps.push_back(lsm);
 
       // --- Dynamic Shadow Map ---
 
@@ -198,7 +198,7 @@ void ShadowMapPass::render(   SceneManager *sceneManager,
       ++smActiveShadowMaps;
 
       // Do a priority update for this shadow.
-	  dlsm->updatePriority(diffuseState, currTime);
+      dlsm->updatePriority(diffuseState, currTime);
 
       shadowMaps.push_back( dlsm );
    }
@@ -306,4 +306,4 @@ void DynamicShadowRenderPassManager::addInst( RenderInst *inst )
    }
 
    Parent::addInst(inst);
-}
\ No newline at end of file
+}
diff --git a/Engine/source/math/mQuat.h b/Engine/source/math/mQuat.h
index 2ea1b94c1..ca6ed5d82 100644
--- a/Engine/source/math/mQuat.h
+++ b/Engine/source/math/mQuat.h
@@ -227,8 +227,8 @@ inline F32 QuatF::dot( const QuatF &q ) const
 
 inline F32 QuatF::angleBetween( const QuatF & q )
 {
-   // angle between to quaternions
-   return mAcos(x * q.x + y * q.y + z * q.z + w * q.w);
+   // angle between two normalized quaternions.
+   return mAcos(q.dot(*this)) * 2.0f;
 }
 
 #endif // _MQUAT_H_
diff --git a/Engine/source/sfx/fmod/sfxFMODDevice.h b/Engine/source/sfx/fmod/sfxFMODDevice.h
index f710faa20..fc15041e9 100644
--- a/Engine/source/sfx/fmod/sfxFMODDevice.h
+++ b/Engine/source/sfx/fmod/sfxFMODDevice.h
@@ -105,8 +105,8 @@ struct FModFNTable
    }
    ~FModFNTable()
    {
-      eventDllRef = NULL;
       dllRef = NULL;
+      eventDllRef = NULL;      
       delete mutex;
    }