The Vireio Driver suffers from this annoying problem, shadows and/or reflections are screwed up when rolling the head in most games, and you have to disable them or disable rolling to have a good experience.
This is a bit related. The some games like Skyrim use a d3d9.dll to enhance the shadows and shaders. Is it possible to use Vorpx and an ENB d3d9.dll at the same time or chain them to work together?