I've run sack-up probably a dozen times in the past year, and never got stuck, unless i chose to try something dumb. I was there in february, and as far as i know, no trails have been modified since then because there hasn't been any work parties or anything. There will be next week though, and i'll be up there for that most likely.
Anyway, i'm heading up to reiter this weekend. Not sure which day, but if anyone's interested, shoot me a message today and we can meet up.