JimH,
I tried your suggestion, but to no avail. I also tested out a couple of other variations on the process that might help you track down the problem:
1. After re-ripping Moby 18 via Media Jukebox, I fired up WMP 7 and added the tracks to WMP's media library. Interestingly, WMP showed blanks for the new tracks' tag information implying to me that it was unable to read the tags written by Media Jukebox. I edited the tag information in WMP and exited WMP. I then restarted Media Jukebox and was able to successfully edit the tags in Media Jukebox.
2. After deleting Moby 18 and deleting the entries from the media libraries of Media Jukebox and WMP, I re-ripped the album with WMP. I then fired up Media Jukebox and was able to edit the tags without any problem.
These two tests imply to me that there is a problem with how Media Jukebox is saving the tags -- but, of course, I'm not an IT person...I don't even play one on TV.
BTW - I just installed 8.0.285 RC and the re-ran these scenarios; unfortunately, the problem persists in this version.