When I run a vmware player in ubuntu and virtualize windows 7. It happens 10 times a hour at least that the focus is set back to ubuntu.
If i move the cursor to the top left, the ubuntu unity menu is shown. Though i'm in the full screen mode of windows 7.
The current solution is to alt+tab in ubuntu and then load windows 7 back on. And then it goes a while and there it is again..