the case of the lost window

here is this problem with the windows OS that is known amongst most people regularly working with multiple screens. Some programs will remember their last on screen position and keep on popping up there, even when the display is no longer attached to the computer and/or disabled in the OS display settings.  Some graphic card vendors (I believe nvidia at least) provide you with some additional software which can be configured to prevent dialogs and windows from opening outside the visible desktop space.

For the rest of us I have written a little tool (md5 windowreset.exe bff8b54a89a188793eb9b6bfbe9e8526) which tries to detect all off-screen windows and dialogs and moves them to the primary display.

edit (thanks hans):
another (not well known) option that works at least for windows that appear in the windows taskbar is to right click the offending window and to choose “move” from the context menu. Now you can use your arrow keys to navigate the window to the primary display. Again, this will not work for some dialogs that appear off screen.

Usage: when you start the program it will open in an console window. While running it will try to move all windows and dialogs that are currently outside the visible desktop to the primary screens upper-left point.