I discovered a rather annoying bug that happens when you launch a Golden Age when you have more Great People than is required. I had 5 Great People, 1 Merchant, 2 Scientists, 1 Spy, and 1 Prophet sitting in cities (just got the spy, saving the GM and GS for corps) and went to launch my second golden age. Clearly the game says "Will consume two great people," so I shift-clicked the Great Spy and Great Prophet and initated the Golden Age. Low and behold, all 5 great people disapeared. Save is attached. Just observe that its my 2nd golden age by looking at the great people consumed on mouseover, then launch the Golden Age and observe all 5 great people disapear.