Quote (jlhromeo @ Jan 6 2017 04:54pm)
Do you have a save before you accepted the quest?
If so, download the patch and then load that save, should work. The unofficial patch fixes hundreds of bugs like this.
I do somewhere, but I've played quite a bit since. After the portal didn't pop, I loaded a save before I was in the area. So I have the quest, but I haven't been in the cave on my current save.