does it crash on other models, or just this one. stl check for mesh errors. My guess is theres a problem with your geo. I've had a modle that crashed the uvw editor before, an stl check revealed problems with the mesh. fixed problems, and no more crashes. mine was a 'double face' i believe... Hope it helps :)
I have now tried installing the Service Pack 1 for 3DS Max as well as putting an STL check on my model (how the above posters suggested), that showed me 16 open edge-errors. So I began messing around trying to fix those in a copy of the 3ds file, when I converted the model to editable mesh again and put an UVW Unwrap…