Same issue with me, AI is stuck on their turn, I can't see all their units in the FoW, but those that I can see are just standing still. Their first turn took a while, but I could eventually see them start to move (They actually called in reinforcements, not sure if that's relevant). Their second turn has been stuck for about 10 minutes. I've gone through and done everything else that was waiting just in case there was something like the Congress of Humankind that was forcing the AI to wait.