I have no idea what the actual problem is, but I think I've got my build working again. After lots of playing around, I stumbled across aparent problems in prefs.js. I reverted to an old copy of that file (not sure why I had one), restarted, and I can now close Mail/News and restart it at will. I haven't tried running Quicklaunch to see if that affects it, but I have tried my restored profile with both a trunk build and a RC1-branch build. It's currently behaving on 2002041512 for Win32. Give it a try and post results.
I didn't get todays build working due to another problem -- mozilla seemedto hang at the "default browser" prompt. Anyone else see this?
