Is there a way I can force Firefly to completely rescan the library and update any and all changes that were made, no matter how minute they were?
go the firefly web admin page and hit the start full scan button. You may also want to change the ‘scan type’ in the config page (advanced configuration) to 1 or 2 to perform aggressive scans – takes a lot longer mind you but maybe you’ll need to in order to pick up the changes.