I've been having intermittent problems with applications freezing, and I've finally had a string of consistent failures that lead me to suspect that pulse audio causes apps to freeze when they are expecting to play a sound but something about making the sound fails.
Specifically, I'm running gnome under f10 with the pulse audio with the famous mod to default.pa:
load-module module-hal-detect tsched=0
I'm using the proprietary nVidia driver from PRMfusion. It's a 64-bit machine.
The app in question is gedit, which wants to make sound when doing a search, inserting date and time, and many other things.
(1) When the sounds arrive, there's never a freeze
(2) When there was sound at launch, the if the sounds stop coming, there's a freeze.
(3) One time, there was a partial sound, and instantly there was a freeze.
These sounds are generally associated with dialog boxes, but there may have been a few cases where it wasn't.
I can go ahead and kill the app and restart. I eventually get lucky most of the time. Otherwise I have to restart X. I may try disabling such sounds and see what happens.
Does anyone else have this problem?