Playback in camera view is flickering I'm having trouble finding an answer to this, as all my searches come up with people suggesting ways to make a camera shudder effect!

My problem is that in Blender Game mode, when I switch to camera view and play the game, the background outside of the camera view jitters/ flickers very fast.

If I start the game in user/ortho view, it doesn't happen, and when I move to the next level, the camera view is perfect.  It's only when I start the game in camera view.

Does anyone have any suggestions?  Is this a known problem?

Thanks!
This seems to be a mac issue - the solution is to change the Window Draw Method in User Preferences/System - from no multisample to Multisample 2 at least.