Trying to delete transcoded files. Initially trascoded files used about 49GB after delete 28GB remain. I have rebooted and deleted again several times. 28GB remains. Using file explorer I confirm there are 28GB of transcoded files. Why won't Mezzmo delete them?

Second, "View Transcoded Files" is of little help. Mezzmo codes the names so I can't match the transcoded file to the original media file. How do I match the transcoded file to the original media file? So I can determine which transcoded media is not being deleted.