Expect you will also find, adding to your frustration, that following a library scan the erroneous matches will pop up again, forcing one again to manually unmatch. This thread suggests that once you force an unmatch it should stay and not rematch erroneously. Un-matching Mismatched Items - Album Art - Must this be done on an item by item basis? - #11 by Fletchesus. But I am finding I need to unmatch daily (following each daily library scan), which is obviously not ideal. Interestingly - I am finding this issue with PMS running on Windows 10 only - PMS on Mac seems to retain the unmatched artwork.
