Alt Tab stops working after 6 alt-tabs

[Garnier]

After alt-tabbing in and out of the game 6 times, when you alt tab back into the game it shows a black screen with the mouse cursor.

I only tested this in the multiplayer lobby so far. It did the same thing three times in a row. I restart the game, go to MP lobby, alt-tab out and in 5 times, and then on the 6th time the bug happens.

Edit: After more tests, it doesn't seem to always fail at 6 alt-tabs, sometimes it is sooner.

In any case it isn't a game-breaker.