After i pressed ALT + TAB my game froze and when i launch the Automation Launcher and press “play game”, it just closes and nothing turns up. And when i check in the KeeEngineLog it says : “Pending device reset” and a LOT of “failed resetting device!”… It is really annoying, anyone knows the problem? 
That is a known issue, yes. Alt-Tab currently is like jumping out of a car on the highway. It will be fixed eventually. For now we’d recommend using windowed mode.