I crashed Aurora in mid calculation with Windows Task Manager and that appears to have fixed the problem - have even had a real gunfight between aliens since.
I had a similar problem, 3~4 month of 1day auto turn . . .
Wonderfull, this worked for me, after i relaunched the game, i had a whole screen of allied contact update, i think that was them that caused this #§?@!
I noticed that my DB was larger before i solved the problem, it lost 12 Mo after.
PS : I keep a backup of the DB before and after bugs was solved in case you want to take a look Steve.