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I've noticed a strange issue that I haven't seen anyone else mention (unless I overlooked it), and that is whenever I Alt+Tab out of the game, when I return my keyboard is completely unresponsive. Only the mouse cursor can be used to navigate the game at this point. Anyone know of a solution to this problem? I'm running on a laptop, 64bit Windows.
This question / problem has been solved by bevinatorimage
Press "alt" after switching back to the game.

I'm not sure the cause, but it's easy enough to fix.
That seemed to work. What an odd problem.
Thank you.