Jimmy, I found this from their website:
When the Aurender searches for album covers, it first searches for the “front.jpg” file. If there is none, then it searches for the “folder,jpg” file. If there is none, then it searches for the album cover in the song metadata.
Try this, use one album that is in your folder and add an album cover file to it. Go to someplace like Google and find the artwork for said album and name that artwork file "folder.jpeg" without the quotation marks of course. Place that file into the folder that contains the music files for this particular album. Delete that album from your W20 and import it back in again with the new album artwork file. Hopefully the W20 will find the artwork file and solve your problem.