QucikSand version 1.2

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It's hard to explain, but I'll do my best.
When I have the window in the top left corner it's working fine.
But when I move the window towards the middle of the screen the mouse gets more and more out of relation to the window.

So you're probably checking the mouse position relative to the screens origin point (0, 0), instead of checking the mouse position relative to the Windows position. Might just be a Vista bug I don't know :)