I get the same with flightgear 1.91 in Karmic and kernel 2.6.31-17-generic. The sound sometimes comes back intermittently but most of the time it is crackly or completely silent.. When I remove pulse audio the sound in flightgear works properly. Exactly the same applies in Second Life as well. In flightgear if I try to end it while the sound is bad, it freezes. If it is in windowed mode I can kill the fgfs process with the aid of System Monitor and/or terminal. If I end flightgear when the sound is in a good state, it ends without freezing. After having to kill fgfs the gnome-screensaver wont start in gnome unless I end the gnome-screensaver process and power-manager process then restart the screensaver and power-manager from the gnome-screensaver Power Management. This is probably a separate bug but it is affected by the flightgear sound bug which in turn is caused by pulse audio.
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