I am running the latest version out (TA 2.02). I think I know what caused it though. I hit the turn button, and then remebered I forgot to do something, so I tried to load when it was in the middle of doing the end of turn stuff. Then when it loaded I couldn't move any ships. I tried loading again, and loading different saves, but all were like this. Thats why I thought the saved game was currupt. I was pretty frustrated, so I didn't get back to the game for a little bit, but it seems the problem went away once I restarted the game.