Indirectly also causes the mouse capture API to scale incorrectly. (The more you move it down, the less of the bottom half of the window you can navigate with.)
-Use my keyboard to change the resolution in settings, by changing the resolution to a different one, then to the desired one to force a redraw.
-Make a guess at how big the window was. Doesn't always work.
Suggested Course of Action:
Do not allow resizing of the window. In the off chance that a window is resized, write Win32 api code that causes the 2nd button (resize button) to allow a user to force a redraw of the window size to it's correct dimensions.