Hi, I am also having the same problem with the preset list becoming corrupted. I have tried the complete reset reload of 2.82 and still have the issue.
The interesting part of this is that the preset locations that are corrupted are different from the first time it happend.
This seems to occur while using HX Edit to copy paste presets which is something I do often to build gig specific lists.
Symptoms are the same with the affected presets either being blank, or they have a few characters in them, or they have the question mark outlined by a diamond at the front of the preset name.
I started a ticket with support so we shall see what happens.
You are not alone with this issue though and it is very disturbing.
