I had the same problem and fixed by doing this:
In VirtualBox, go to File -> Preferences -> Input; then uncheck "Autocapture keyboard" (http://forums.virtualbox.org/viewtopic.php?t=572)
I had the same problem and fixed by doing this:
In VirtualBox, go to File -> Preferences -> Input; then uncheck "Autocapture keyboard" (http:// forums. virtualbox. org/viewtopic. php?t=572)