Mudbox and vista!

Ok – here is the thing.

I make animations using 3D Studio max and mudbox. I did have a quadro FX 1400 graphics card and it ran both OK. It finally stopped working and I replaced it with what I could afford at the time which was a 260 GTX. Now when I run mudbox all I get is a white screen – if I turn off the vista theme and use windows classic it works OK – I know its not a big problem but I was wondering why this happens and if anyone had any ideas how to run mudbox and the vista theme at the same time.

Thanks in advance -