I don't remember if mp3tag used to do this, but when an mp3 has a track number such as 01/20, or 1/20 and you try to rename the file based on the id3 track attribute it inserts the '/'. This doesn't make sense, it should be an option to disable it.
Just use $num("%track%",2) instead of %track% in the formatstring.
Best regards,
~ Florian
thanks florian