Problem: Every time you search for servers or quick-join, you get a crash to desktop.
Workaround: Set the game type to anything but "All". For some reason, it doesn't crash that way. It's pretty annoying, but it does work.
If you're having other network problems...join the club. With Norton/Symantec Antivirus/Internet Security, I have to disable the ENTIRE security system to get online.
Good luck! Hopefully they patch this thing soon...