Hmmm, well that is pretty mysterious.

Is there any difference in behavior if you try to minimize MoI when MoI is not maximized? I mean push the "restore" button that is in between the minimize and close buttons, so that MoI is a smaller window with a regular title bar on it. Does that then minimize ok at that point?

You might also see what happens if you set up a keyboard shortcut to do the minimize, you can do that by putting in this script for the shortcut key:
script: /* minimize main window */ moi.ui.mainWindow.minimize();

Another thing to try is to temporarily disable your virus checker and see if that has any change in behavior as well. Sometimes virus checkers can kind of intrude into how things function and introduce some strange side effects as well.

- Michael