Hello, thanks for your patience, we have fixed this issue and rolled it out to all users. It was only happening for Windows users, so the following instructions are win only. To restore your images you should
1. Force quit the CCLibrary Process, all adobe apps, the creative cloud desktop app, and any other cc app from Task Manager
2.
Remove the contents of the renditions folder at the two following locations in your file explorer:
%appdata%\Adobe\Creative Cloud Libraries\LIBS\\collaborated\rendition
...