I dunno. Brad's been making changes to the system; he's been out to fix the disappearing commas problem. The commas disappeared from profiles because of a problem with the HTML filtering routine. He fixed that problem and the commas show up now - as does everything with HTML code - but now [] comments don't, which kind of sucks since a lot of people have used them in their profile.
Until he can get [] tags operational just use <> tags I guess.