i beat act 5 last night while still not having 2 or 3 done on the character i beat it with. so i knew at that time i wouldnt have adventure mode unlocked. however, today when i finished both acts that where incomplete i still did not unlock adventure mode. does anyone know why this would happen?
I had this same problem. One tip I found VERY helpful was to:
Select 'Public' game from the settings menu, and then browse the acts. At the top of each act you should have a titled 'Act X - Any quest'. If you don't, that is the Act you are missing a quest line in. Good luck.