F11 Sound From Only One App

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http://forums.fedoraforum.org – I recently purchased a new system and chose to install Fedora 11. I absolutely love the speed and functionality of Fedora however, I have run into a slight problem. I can only get sound from one application at a time. If I start listening to an .mp3 and then launch youtube, I get no audio from youtube, however if i start youtube first then the .mp3, youtube sound plays but .mp3 doesnt. Whichever App I start first is able to play sound, yet all subsequent apps do not. I do not know where to start on this one, as ive never encountered anything like this. My audio Device is: 05.0 Audio device: nVidia Corporation MCP61 High Definition Audio (rev a2) (HowTos)