Alt-tabbing the game wont stop the game from detecting mouse movements, so each time you changed the active program, Map will just move with the mouse. And a second of random movement with the mouse will just move you no where. When working/playing at the same time this is a bit disorienting.
This is not a big deal, but figuring that out took some seconds. I thought display just stopped working, (not the HUD) so this is just a small annoyance.