I have even tried removing the Music folder (My Music stored on my I drive) and reading it I've deleted the library from WMP and let it rebuild nothing works although the music is added and plays fine otherwise.
It didn't as ALL the song now show with a generic music icon! Despite leaving the program open for a day the album art never appeared. So I decided to do an app reset of the Groove app and let it rebuild its database in the hope of fixing the issue. Note all album art continues to be displayed correctly in Windows Media Player, iTunes and Media Monkey. Anyway, Groove previously displayed them and seemed to dropping more and more as I used it post-upgrade. All of my music uses ID3v2.3 tags and has embedded 600圆00 art taken from JPGs and PNGs.
Since updating to Windows 10 Creators Update (v1703) I noticed that my 350 GB collection of mostly MP3 with some FLAC music was missing some album art which was previously showing in Anniversary Update (v1607).