I use XPE a lot because I find its enhancements very good ! However I often work with Xara X1 and my 3D programs open toghether and then if I try to work with XPE the enhancements control panel doesn't work correctly : sometimes the effects work while the slider doesn't move, or sometimes no changes occur on the pictures.
The 3D applications I use are Lightwave and Silo, and they use intensively the OpenGL display mode. Perhaps that's the problem.

kindly,
ivan