For info, I've had it on all the MA3 betas so far too. Mine is set to match the desktop settings of 1680x1050 at 60hz on a Samsung 2253LW 21.5" screen. When I exit to desktop, there is a pretty horrendous flickering for a second a two, then its okay. It flashes about 3 times. I have an Nvidia 8800GT display card on Vista 64bit Home Premium.
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