If I start FS in a window smaller than the full screen, then maximize it, the cursor is limited to the old window and cannot go outside it unless I use Alt-Tab to switch windows. Then when I move back into FS I can click on the UI outside the old window size. However if I move back within the boundaries of the the old window pane, I cannot move outside that area again without an Alt-Tab. OS: Win 7, FS 1.5.1 (not updated to 1.5.2 yet). It's an irritation more than a major issue & there is a work-around.