I completed research on a tech on the same turn as the spell of making completed.  The game showed the spell of making victory screen, the game recap and ranking, but after that, the main menu came up but was covered by the research screen.  I can't see the "Quit" on the main menu, because it's covered by the research window, and I can't dismiss the research window because clicking on Done or Cancel does nothing.

The escape key did nothing, and I had to kill the game using task manager.

In case a saved game will help, it's here.  When I load that saved game and hit turn, I don't get the end game sequence, but I do repeat the problem of not being able to dismiss the tech window with Done or Cancel.