libao crashes with arts
I maintain gaim for gentoo linux. I see one bug every other week about crashes when sending/receiving IMs. Gaim devs have confirmed this to be crashing when gaim attempts to play notification sounds through libao, which crashes when trying to use arts.
The latest bug report I have is here: http://bugs.gentoo.org/show_bug.cgi?id=87348
Gaim devs said they just close their bugs from other distros so I don't have much other evidence to show you. I'm sure one of them may comment here now that we've found your tracker.