When attempting to select another kit, the selecor pane appears, then disappears leaving only a drop shadow. This seems to correspond to unplugging an external monitor, but not always. The screenshot is of a situation that occured without removing a monitor, when it previously had been working ok.

The fix is to move it around between monitors, maximizing until it somehow starts working again. Very annoying! Happens a few times a day (depending on how often I go mobile)