Avweb reports that the 340 had been cleared to cross and the 767 cleared to land. On that basis it would seem to be the 767 crew exercised discretion and went around with the belief that margins were being eroded. That's what's supposed to happen - isn't it? As some would say, move along, nothing to see here. That's if the official is to be believed, and no reports filed by either airline.
767 Go-Around Video Goes Viral - AVweb flash Article