Didn't do anything in particular. Offers/Videos do change (sometimes on a daily basis) so the thing might have just droped from your queue. Definitely write here in the thread if you get the issue again and keep what I requested in mind.

Btw about your question "Do videos that error-out count toward the total videos for the day?" - They do not! I was suspecting that this was the case but I wanted to be sure before I could confirm. The other day I had like 13 videos die off. Still reached what my soft cap seems to be of about 10-15 boosters while in total engaging with like 25 videos. So yea, it's confirmed that if a video goes faulty, you don't lose a chance to get a booster.