This happens in all browsers, only for flash objects with multimedia content. Non-multimedia flash objects work just fine, until I try to access the Settings, at which point the whole object becomes unresponsive (but doesn't give me an error about crashing).
I was also having problems with my audio drivers today; I'm not sure if that's related. I fixed those problems by following these instructions, ending with this command:
sudo aptitude --purge reinstall linux-sound-base alsa-base alsa-utils linux-image-`uname -r` linux-ubuntu-modules-`uname -r` libasound2
I've tried basically everything I can think of as well as everything suggested in forums, blogs, etc. and now I'm at my wits' end. Anybody know what's going on or how I can fix it? Any help is greatly appreciated.