I realise it doesn't help anyone who is having the issue, but just in case it helps pin down what makes the problem happen, I had no issues with Volo despite only doing this yesterday after the first hotfix. However, while he appeared immediately he was free, he wasn't at the party the next night as he was in Early Access. I'm not sure if that was a bug or as per design, but seemed a bit odd. Though not as odd as Zevlor not being there (unless he was and I simply didn't find him).
