I am finding tags truncated at 30 characters.
For example, I set the album field to "Saturday Night Fever: The Original Movie Sound Track"
Windows Explorer, Properties and Media Center report the Album Field as "Saturday Night Fever: The Orig". I can use their Interfaces to update the field and they will then show the complete Album title.
I have tried setting just Write ID3v2 and I have tried setting write both ID3v2 and ID3V1. Neither setting changes how this works.
Perhaps I don't understand the options for MP3TAG, but reading the documentation hasn't given me any clues.
I am using Mp3tag v2.36