After installing the new Alpha v6 (as administrator with "remove old stuff") I rendered a scene with the attached result.
You can see the v5 version at the top and the v6 version at the bottom.
A new test-scene with plane, teapot and light was ok.
(I use 3ds MAX Design 2011, 64Bit.)
Do you have any idea, what's the problem?
Kind wishes, Marcus