I'll try and keep this short, but I want to be sure you are aware of all the steps I took.
I downloaded and installed the latest evaluation copy of Media Center 12. I imported a folder I have on my PC which holds all my MP3 files. These files were alreaded tagged with a previous program (I dont remember which one). There was also a lot of cover art .jpgs in that folder. The cover art was NOT in the tags however. All these files (MP3 and JPG) were in a single folder with no sub-folders.
After importing all files, I selected all of them and requested that all Cover Art be retrieved from the Internet. I noticed right away that quite a few of the files got cover art for a John Denver album (even though of course the artist wasn't even John Denver).
I then discovered that MC was picking up one JPG called folder.jpg that was indeed a John Denver cover. I then deleted ALL JPGs from my import folder and cleared my library to start again. I also didn't want cover art stored in the tags, so at this time I found and unchecked the setting to have MC store cover art in the tags as well.
Now whenever I retrieve cover art from the Internet, if the tag values do not result in a solid hit, I still get John Denver as the "default" cover art.
This is one of those stupid little things that keeps me up at night, so any help would certainly be appreciated.
Thanks
Mark