Why this isnt a major bug its a bit inconvenient as i use my second monitor for many things why in game and occasional need to tab out for a few seconds due to the bug a few seconds turns into a few more and then im dead lol on multi player.
EDIT CSR Kryssar:
This can be relevated to blackscreen randomly or when alt-tabbing in single monitor that may be divided to more than one screen that can be always "repaired" by another alt-tab to win and back.