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It's good to know that there's a workaround, but this is a brutal bug when you encounter it. I hope that it gets fixed.
 
Upon further review, the workaround is not acceptable. I am not able to scroll the map with the mouse cursor near the edges. In general, windowed mode does not work well for this game.
 
Use WASD to move the camera

And yes, it sucks. It's an engine thing, been around since Warlock 1.

Really? I could Alt+Tab out of the Warlock 1 fine. In fact, in almost every game I did, just to look at the wiki.

EDIT: It just occurs to me you were probably talking about the map scrolling.