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Having the exact same problem as described and shown here:

The game was working fine when I installed it yesterday in both software and D3D modes. I've tried everything suggested including different config settings, that different config exe version Raze linked, the Win 8 patch I found on Steam, etc. Nothing works. Anyone got any ideas?
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Well, it would seem rebooting the PC does solve this problem. For those that have this problem, keep in mind that it has to be a restart while the PC is already on. Shutting the PC completely down and then turning it back on from complete power off will not work, you must use the "restart" option instead and NOT "shut down" in Windows.

Mods can mark this as solved.