Looking at the screenshot from the opening post, yes, definitely some cloud folder configuration issue.
Updating Gig Performer may have happened at a similar time as the issue, but that is a coincidence.
Definitely:
- Create backups regularly → [blog] Gig Performer Maintenance: Save, Export, and Backup
- Keep multiple versions of your gig file
- If you want to use a cloud folder make sure you had configured it properly