I have a similar issue. Gaim crashed in the backround when I was using Firefox, with many tabs openned. The system was already very slow then, almost non-responsive. I also had Evolution, BitTorrent (uploadind) and Rhythmbox working on backround. My report goes attached below.
** Attachment added: "Gaim crash report" http://librarian.launchpad.net/5042443/_usr_bin_gaim.1000.crash -- gaim crashed https://launchpad.net/bugs/68463 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs