Running GalCiv II ultimate edition, Windows 7 64bits. All drivers updated, game updated, no mods.
Latley the games "Turn" button becomes nonactive. It turns grey, and can't be used. I can still use all functions in the game, menues etc etc, except moving my units. I have to quicksave, exit the game, and restart to get it going again, only to have it all happen again...when it happens seems random.