I am struggling with this. I have 2 Guest OS running. A) windows 8.1 Preview B) OSX Mavericks DP6 Both the guests are running in full screen mode. If I want to switch between the host and either of the guests. Hitting F3 (MacBookPro) on HOST shows all desktops and I can select. When in Win 8.1 guest, the same key multiple desktops Problem is Mavericks guest. I don't see any elegant way of coming back to either HOST or Win8.1 guest. Note: You can also use Control+Left/Right Arrow to switch between fullscreen apps. It works fine on HOST & Win8.1 guest. But Mavericks guest refuses kneel down. Any Help ?