Mine isn't working offline either..
ID - 76561197989327715
Was in the middle of a fantastic game, NZ v Ireland, thought it was a save game corruption so deleted it, reinstalled the game, reset all my players.. Gutted that its made no difference, but guess if everyone is having the problem then its nothing to do with my machine.
Ironically I got the PC version just because I couldnt tolerate the save game crash on the Xbox before the workaround was found out.
This game is as frustrating as Sim City 2013. At least it is good