Similar. My save is corrupted, so I had to go back to an older one.
It hung once as my unit took over a city. I restarted and tried to load the quick save, but it crashed with a DX11 error. After that loading the last save would always crash. I had ot go back to an older one.
Problem still exists, eventually I will hang again as I take over a city. It's happened a few times.