Since the release, I've seen that some Set List Maker databases contain corrupted text formatting that crashes the new iOS version. This only affects a tiny fraction of Set List Maker users, and I don't think it affects BandHelper at all.
If you do see this problem, please send a message from Help > Request Tech Support and I can clean up the corrupted data for you. However, I will be traveling tomorrow through Monday and won't be able to help during that time, so if you haven't installed the update yet, I recommend waiting until next week to be extra safe.