The "Liberate" city action causes the "turn pending" bug. In the past, when I had this kind of bug (long time ago), I used to press F5 then F9 to reload the game, and it was OK.

This time, I got this exception error:

It looks like it corrupts 2 files (as indicated by Steam files verification). 

In the uploaded file, just hit "Liberate" city (Chang'An) then it freezes forever...

Austro-Hungarians Turn 189 before liberate.ctr

J²G