I never had crash-problems with Vue 4.2, and have them constantly with 5. I'm on a P4 1.6 Ghz, 1Gig ram, fx5950 ultra 256mb video card, and over 180 gig free harddisk space. Vue 5 definitely seems to have a problem handling large models. I am working on a very large architectural model, which I imported into V5 at an earlier stage (appr. 800,000 polys). It worked fine. After additional work on it, it went over 1mln polys. Vue 5 would still import it, but anyy subsequent action resulted in a crash ('out of memory' error). I've now split the model up into six separate parts; if I import these one after the other and then group them in Vue, everything works fine, though somewhat sluggish. If I put the group on a separate layer and hide it, there's no problem at all.