Jeff, We have had the same issue with Pro/E, on both Unix and Intel platforms, WF2.0, previous versions and also WF4.0. We will be working and with no warning, we will get dropped out of Pro. I just got a new computer (M6400, had a M65) and was kicked out today when going to create a tiff image. It is not consistent, as I went back in and it was okay doing the exact same thing. Just save often and report problems to PTC is the best thing, but hard to reproduce sometimes especially this. Dennis