TO REPRODUCE: Make sure you have two two spaces. On the first space, create a Firefox window and move it to the right side of the screen. Move some of the window off screen. Use the three-finger swipe to move to the space to the right. RESULTS: Observe part of the Firefox window appear and disappear while moving between spaces. Lots of flickering. The hidden part of the window should never appear: spaces do not work as multiple monitors do. It is much worse with a page where a flash video is playing. But I don't think this is a flash issue.
Added a screen shot that i took while switching spaces.
Summary: [10.7] Flickering when changing spaces with partially obscured window → [10.7] [hardware acceleration: on] Flickering when changing spaces with partially obscured window
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