You might try a reinstall but,..............have you tried importing the model into Bryce and then saving it as a Bryce object to one of the libraies first, then  closing Bryce, re-open Bryce then load the object from the library, then texturing ?  This might work if you haven't tried it this way,..........probably not but it's worth a try if you haven't already. With me it's been tweaked Poser textures,..........I like to tweak the bumpmaps or tranparency maps sometimes,...........I always get crashes doing this,.......absolutely no workarounds.  It's a real pain in the butt ! I hope they fix this soon !  I can't use the bug reporting applet,.............it(wait for it)  Crashes Repeatedly !!

"Any club that would have me as a member is probably not worth joining" -Groucho Marx