Post interview communication can be very awkward and a lot of programs don't participate in it. If we call you and tell you "you are ranked to match" and we are your number 5 or 6 or something, this places you in an awkward position.
"Oh, that's nice, thanks for calling".
Similarly, we aren't allowed to say anything that can be construed as a hint/promise/or wink. We either sound disinterested when we are not, or we risk being reported as a match violation. I do respond to questions and e-mails but I sound very bland even when I'm very excited about a candidate. I never initiate communication with applicants. I'm sure my residents do, but they don't control the list so I see nothing wrong with what they say.
I really wouldn't read anything into a lack of communication once you have gone on an interview.