Same problem, wasn't alt-tab though. I have two monitors and somehow the mouse escaped the constraints of the fullscreen game on the first monitor and onto the second monitor resulting in clicking another app and performing the same side effect. The game then wouldn't return. Could hear the music etc. but it had drawn a black rectangle over about 2/3 of the monitor and debug.err is full of Debug Message: D3DXLine MainUI_MainMap has ref count 2 Debug Me
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