Ubuntu Multimedia :: Flash Apps Going Blank?

I've been having this problem for some time now, but none of the fixes for other flash problems have worked (re-installing Flash, installing Flash-aid, disabling compiz, upgrading Firefox, etc), and I can't seem to find a similar thread.

My issue is this, if I go to a site in Firefox that uses flash like ....., megavideo, grooveshark, or slacker.com and begin to load a video, song, or station, I can't open any other windows or switch to another desktop without the app freezing and going blank; sometimes it just shows white space as if nothing were ever posted, other times it shows a grey box where the app was, but no longer works. If I right click in these spaces, nothing happens as when I right click on, say, a megavideo video and get a drop-down list. The only thing that solves the problem is refreshing the page.

I never had this problem with older versions of ubuntu like jaunty, and it's rather annoying since I can't do anything else while a video is loading or music is playing.