I have had the same problem, system uses a Nvidia GeForce card and dual monitors under Windows 7 32 bit.
I installed MA3 and it worked perfectly, I then upgraded my hard drive reinstalled Windows and all my "normal" software along with MA3 and this is when the problem began.
I have found the cure for it, as mentioned as a possibility in an earlier post, when I unchecked the "On resume, display logon screen" option the problem dissappears, so some sort of conflict there in my case.
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