I changed the ID3v2 comment field using
Tag&Rename. I then opened the file in Winamp, the changes were there. Then in MJ, I had to delete the track from the Media Library and then re-import it, but the changes to the comment then showed up.
I then opened the file in Winamp, made changes to the comment. They showed up fine in Tag&Rename. Then in MJ, had to delete and re-import again, but then the changes showed up.
Finally, I made changes to the comment field in MJ. Opened the file in Tag&Rename, the changes were there. Then opened the file in Winamp, and the changes showed in the ID3v1 comment field, but not the ID3v2 comment field.
So, Tag&Rename recognized the comment field changes made by both MJ and Winamp. MJ recognized the comment changes made by Tag&Rename and Winamp, only after re-importing the file. Winamp recognized the changes made by Tag&Rename, and only partially the changes made by MJ.
Very strange.
Rob