I have the same issue with Lucid, however the error manifests itself after a random period of time. It definitely seems to be related to the skype plugin, as skype is closed at the same time. I've included a backtrace.
** Attachment added: "pidgin-backtrace.txt" https://bugs.launchpad.net/ubuntu/+source/pidgin/+bug/556430/+attachment/1841709/+files/pidgin-backtrace.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/556430 Title: pidgin assert failure: *** glibc detected *** pidgin: double free or corruption (fasttop): 0x0a361900 *** -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs