I’ve seen a lot of people reporting this bug, but many don’t seem to think it’s a bug. Anyway, I’m going to add a new thread because someone wrote an article about it in detail, and I think that will be the most helpful for Blizzard and other people having this issue. I’ve never used these forums before, so I’m learning as I type this that I can’t post links, but the article was from “gosunoob dot com”. This is the gist of the situation, which I’ve quoted: “[I]f you leave this area before completing (but after accepting) the side quest, it will bug out and you will not be able to approach the quest area. There will be a big Red Wall blocking the bridge just before the “Reject the Mother” quest area. Judging by the [reports of other players], for now, there doesn’t seem to be a solution for this.” Thanks in advance for fixing this.