Using ChromeOS, the mouse is not locking to the screen. When I move the mouse (for instance to look around in a game) I hit an invisible wall and can't look anymore in that direction. I did a powerwash of the Chromebook thinking it was because I was in the beta mode, but that did not fix it (and now I lost all my stuff for no reason.... bummer).
This seems to be a general issue for Chromebooks at the moment. It was also discussed here: