I just had this problem in 1.32

Made a save game last night just after taking the Town which the AI had taken back from me.

I took it, they took it back, I took it back

And now i cannot end my turn. I will try and see if I can change anything or move around a bit before ending the turn.

Also the hourglass seems to be stuck at a 45 degree angle. The end turn button looks 'blacked out', it does not look like a button anymore.

I tried to make all my units move so the 'Turn' button would become green. It became green, I pressed it and then the stuck @ 45 degrees hourglass with a 'blacked' out turn button reoccurred.

Trying to load a autosave. For a second I thought it wouldn't help because at the end the turn button was all black and indented again(not sure if this is normal ) but redoing the battle and not ending my turn in town seemed to have solved the problem.

5th edit. In the save game I saw that all my 'relations' had disappeared. As if I had not met any of the ai yet.

Must have been some fluke, thank god for autosave because I was rather enjoying this map "the Wildlands"