Had a look at the saves:
1200: End turn causes stall at Egypt's turn and game is basically dead.
1202: End turn works fine but at 1204 I see the corruption you mean. Ending game then results in an unspecified error.
Errorlog doesn't show anything.

My suspicion is that your massive amount of cheated(?) florins are the cause and/or that the problem had built up from a savegame corruption some turns earlier (1200 comes to mind)