I reported this as a bug on that forum, but did Devs change how Bard Masteries function in Fel? I can't seem to find anything in the past patch notes that indicated a change. I'm noticing that when you turn on the Peace or Provoke mastery that the bard flags grey. None of my teammates are red or grey and none haven't committed a hostile or criminal act while the song was active.
One or more of the characters in party with you are bugged, and performing any beneficial acts on them will cause you to be flagged as a criminal.
I had a sampire that was bugged like that, xfering from one shard to another seems to have fixed it though... didn't try to page a gm on the character, but that should work too.
You should get the "guards can now be called on you" if you perform any beneficial acts on the character(s) in question, even in trammel towns, or guard-zone.