From Dietmar Funck, "I've noticed an issue with osgUtil::RenderStage::runCameraSetUp() if the number of buffer attachments of the camera decreases according to privous calls.

This happens because RenderStage::_bufferAttachmentMap is updated only for the number of buffers the camera has when runCameraSetUp is called.
For example if there were 4 attachments and now only 3, only the first three elements of _bufferAttachmentMap are changed. The fourth is just as before - however it shouldn't be there.

Calling _bufferAttachmentMap.clear() before resolves this problem.
"

src/osgUtil/RenderStage.cpp

@@ -234,6 +234,7 @@ void RenderStage::runCameraSetUp(osg::RenderInfo& renderInfo)
 
     osg::Camera::BufferAttachmentMap& bufferAttachments = _camera->getBufferAttachmentMap();
 
+    _bufferAttachmentMap.clear();
 
     // compute the required dimensions
     int width = static_cast<int>(_viewport->x() + _viewport->width());