[Mobhack]

Perhaps the problem is your 2 monitor set-up.

Try reducing to one monitor. See what happens. (The graphics library the game uses was written long before multiple monitors). Perhaps try changing which of the 2 is the only one (if resolution differs).

Desktop resolution will use the real estate of your monitor - but dual set-ups may well confuse it. Especially if the 2 monitors have differing resolutions!. So experiment - and also look at your video card set-up widget since it may have options, like "use only monitor A in dual screen mode when running programme X".

I don't have a dual screen set-up so cannot test it out - but I do know that folk do play the game on such installations.

Also - start your tests in windowed mode (in desktop resolution) since that causes less conflicts, especially with Vista/Seven and the execrable Aero interface that thinks it owns the 256 colour palette exclusively.

Cheers
Andy