I'm on turn 225 of a huge universe with all opponents. When I try to build in a shipyard, it clicks, but the selection is not added to the queue. When I try to build on a planet, it clicks a sound, but the selection is not added, even if a modifier like economic stimulus or research.
Consequently, I cannot end the turn.
I also cannot save the turn. If I press escape to try to save, Resume is highlighted, but save/load are darkend and not allowed. "Please wait until invasion, ship movement, battle, and colonization are resolved." None of these are pending, as far as I can tell.
Is this an auto-lose bug?