I played through all of act I with a Monk. All the cinematics played properly. I logged out just before the end of act I, but when I logged back in I was a couple quests in on Act II bit I was still just lvl15. I thought I had been hacked and someone had played my character so I changed my password and reset my character back into the end of act I. But, after that the cinematics were not playing correctly and none of the waypoints were unlocked..