Just downloaded OWB a few hours ago, and it seems that every time the introduction cutscene is finished playing, I am confronted with an error message saying that the disc is unreadable. The disc does not appear to be damaged, and the game was working perfectly prior to downloading the DLC. Curiously enough, I only get the "disc unreadable" message when trying to start the DLC.

Is anyone else encountering this problem? Any known fixes?

Same problem. The "Questin' Mark" challenge pops up marking the quest is completed, the flash happens, and the screen freezes with everything bathed in the pale blue of the flash.

So, maybe a fix.... I had Salt-Upon Wounds Helmet, and the gecko-backed leather armor, reinforced, equipped. I also had Salt's power fist, daturana, and weapon-binding ritual in my inventory. I dumped them all at my safehouse, and OWB loaded up properly.

yeah same here but I do have the pistol on me now but i am watching the beginning so we will see if that has ne thing to do with it. I also went back to an earlier save luckily I still had the one before I went to zion, and the only thing i took out of the crate was a light in the shining darkness and I am in game now so I would def. try getting rid of some of the honest hearts stuff then trying again.