Thu Jun 23, 2011 11:20 pm
normally, this happens when one of the game turn files did not write properly (my guess is you have Vista or Win7).
If so, go to your PON directory, to the VGN folder, then to the Saves folder. Go to the Backup1 folder copy everything and paste it into the Saves folder, overwriting the 3-4 files that are there.
You'll be back 1 turn but the game will work fine.
I suggest saving and quitting (and restarting) every 6 months or so.