Lyne,
I have seen posts in other 3D forums where ATI cards have trouble with OpenGL. Frequently, when reading posts of Vue users with severe problems, it appears they are using ATI cards. Of course by turning OFF hardware acceleration, you are effectively rendering your ATI video card useless, but also creating a much larger burden on your cpu to render the wireframes (which is typically done in hardware).

Perhaps you should consider an NVidia card. I have them in 3 different computers and all of them run Vue6-I just fine.

best of luck, Chipp