Tried once more, working on a model started in Carrara4. With the first change I made of any kind (no matter how trivial) the entire UVmap was scrambled. Tried to select just one sleeve of a jacket, and since no combination of selection tools would allow me to smoothly add to a selection (the old "hold down shift and marquee again" didn't work, of course) I had to hand-painted every single poly in my selecting. Detached polygons, started to drag....and Carrara locked up. So I did what I should have done Monday. I put Carrara5 away and re-installed 4. I miss the edge tools and the hotkey camera controls but this is simply too frustrating to try to model with.