Just got my Helix this week (used), upgraded it from 2.50.0 to 2.82.0 and started loading it up with presets and....ran into this same corrupted set list and black screen hung Helix issue.
I saw it when I tried to grab and drag 4 presets at the same time from a folder into the HX Edit over 4 new preset entries. Helix hung (black screen) and I got the same error messages mentioned above to on the HX Edit and then could not get the set list to clean up (some empty line some line with ?preset and others with odd text.
I did however manage to clean it out by saving the ´corrupted' set list as it was, then by just re-importing it. It came back in clean.
Then to not run into the issue again, I only dragged in one preset at a time (not 4) and that worked. After dragging in about 15 presets, I also stopped, closed the HX Edit tool and powered down and back up the Helix. This allowed the Helix to come up and ´rebuild' the presets that I added (sorry can't remember the exact term the Helix screen showed after turning the unit back on and after the firmware loads).
Maybe a work around for now....until an official solution is provided.
