I just gave JMRC a try and it changed thousands of files before I realized that a background process was making the changes and killed it.
Is there any way to undo these changes, or get a list of what it changed? I found some MP3s that it changed, so I am restoring them from backup, but I have no idea what other files it changed.
I have to say that this really, REALLY sucks. At least now I know that it does this, and how to turn it off so it won't happen again.