I did encounter an OOS upon reloading after an OOS that had to do with movement routing or a difference in the order of the unit move and a road being built along the route. Rare problem so far but I'll be watching for it. We were able to easily resolve the OOS on reload (which is very odd in itself) by saving again, going out to main menu, and reloading the new save. I have to wonder if somehow one of us going to desktop and the other going to main menu might've caused the immediate OOS. I'll be watching for more of this kind of thing. But OOS's are so rare that we've only had about one each night of rather extended play.