Same problem here. Offline character is not saving, furthermore the save directory in User folder is empty, like the character was never created and/or game progress saved.

Online is having the same issue, both of my characters progress was wiped. Cant get past act 2 in either mode without progress being erased, it crashes at the end of the act and starts you at the start.Edit: Its actually gotten worse it put me act 1 now at level 30.

Same thing here. Is very annoying...