I've had this issue for a while with builds of Mozilla. I'm on MDK 8.2 and scrolling Mozilla with the mouse wheel eventually segfaults. To reproduce, I use the mouse to scroll up and down a page a couple of times (no more) and Mozilla crashes. I'm building from CVS every night. I can try to use a talkback build if it's necessary to determine the problem. FWIW I don't see this in Netscape 6.2 or Galeon.
A talkback would be good. Note: Since you build from CVS, you could also try quit moz, delete component.reg in the dist/bin directory, and restart.
Removing component.reg doesn't change anything. I got the rc1 talkback build and that doesn't exhibit the behaviour. I can't reproduce it with the nightly build either. So I'm going to do a distclean, recompile and see what happens. Followup on Monday.
Ok, I did a complete clean and rebuild and the problem seems gone. So I'm changing the status to WORKSFORME.