When on Skype and in full screen on a call, the menu bar and dock do not appear back on screen when you have come out of full screen. You have to cick in the dock area on where dock normally is for them to appear.
Loss of Menu bar and dock after full screen.
I encountered the same issue.
I have seen this issue as well with Safari.
Safari seems to work fine with me in full screen. May be it all depends on what is installed on machine and what is running at the time.