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theducks - download & install 32bit so you can try on same library & config.
Did you have a look at metadata_db_prefs_backup.json for anything suspect. I've had it go a bit off-centre a couple of times (not regarding VL's though), and Restore database didn't pick it up - I think it checks the syntax but maybe not all/any of the semantics.
Did you try removing and recreating the VL, should only take a moment and you'll lose nothing.
If push comes to shove, you have a recent backup, I trust
BR