RMM is misreading some of my ID3v2 tags (they're read just fine by Winamp and emplode).
Misreading in what way? Are the tags Unicode?
Looks like RMM had ignored the ID3v2 information entirely. It used the filename for the track name on one file, and left all other fields blank. I don't know whether the fields were in Unicode; I'd filled them in them in Winamp for that particular file.
Furthermore, I can't even update the properties of some files in RMM, because it somehow detects these files as being read-only, when they clearly aren't (checking file properties in Windows Explorer).
You also get this error if the file is open in another application -- for instance, the preview thing in Explorer in Windows XP, or even RMM's own MP3 playback window. The error message should be more helpful really.
Odd. At the same time I was updating tag info for some files whose artists had been detected as "None," I was running Winamp, which had all of my music in its playlist. Of all the tracks I was updating, none of them played the whole time I was updating info in RMM, but one of them got detected as read-only.