I am playing as the Aedui and have encounterd a CTD which I was able to reproduce.

It occurs after I end my turn and about the time that Ptolemi is taking his, it crashes.

I have a general in gergovia with two lugoae.

When I end the turn, an army appears on the map on top of that city, but only vaguely, then disappears.

I was able to avoid the bug by moving that general out of the city and then back into the city before the end of the turn.