I went into an MP to drop off a requested weapon.
After I logged out with my weapon/attachment character/mule, I wanted to get into single player, and continue.
Save file corruption.
I closed the game, I restarted game… and the only option now is Start New Game.
I restored my backup from a week ago (didn’t make much progression since).
Reason I say this:
Merely notifying I had save game corruption.
What had caused it, I do not know…