thanks for the response, and I'll try to get additional details when I get home from work tonight.
To try things out, I opened up selected albums and selected all the songs on the album. I didn't select a large group of files from multiple albums or artists, just to test at first.
After I selected all the files from an album, I right clicked "Get From Internet." For some albums, the feature worked in no time flat, and I confirmed that the larger, better .jpg files had indeed been saved. For some, there was no album art on the database, so I right clicked "Submit to Internet." When I clicked "Get from Internet" again on these same files, I saw my cover art had successfully uploaded to the database. Looks like I have some positive additions to make to the database in the next few weeks.
My files are all on a local hard drive and the MC database is local too. All of my files are MP3s and FLACs, as I switched from Vorbis and APE a few years ago. I am almost certain that the problems arose with MP3 files but I need to check tonight. I use the standard "artist - album - track # - song title" format.
My cover art options are to save the cover art in the file itself.
I was able to replicate the problem for several albums, where trying to save a better album image resulted in the existing album art being deleted and the new album art failing to save. For other albums, things worked fine. Unfortunately, I'm at the office so will have to report back tonight to see if I see the same thing and can run some better tests. I wasn't running any other software at the time that may have been using the files (a virus checker is always a possibility, but hadn't activated a scan). I suspect with the help of morning caffeine that the problem may have been that I was synching my Ipod at the time. I really doubt that the problem files were among those being synched, because I went through the recent deal where due to the software update all my files were resynched this past weekend. But, that could be the problem, and I'll check tonight and report back.
J