Under Options->Tags->Mpeg, the ID3v2 character coding in v2.35 defaulted to UTF-16. Upgrading to v2.36 changes the default to UTF-8. This causes a weird extra character to be displayed at the end of each field (Artist, Title, etc.) in iTunes.
I'm annoyed because this has taken me a couple of hours to sort out. I think the default should stay the same, namely UTF-16.