Is it a bad sign if Columbia hasn’t replied to a single one of my emails? I’ve sent them emails concerning my application (there’s a missing material that the status shows they’re still waiting on), and I have yet to receive any response. Has anyone gotten email replies from Columbia Admissions Office?
That sounds unusual. Have you checked your spam folder?
@skieurope Yep, I have, and nothing. I received an email from Columbia concerning another issue, to which I replied with an answer to the matter in hand AND the question pertaining to the missing material, and I only received a very short answer to the former (confirming that he/she had received my response) from someone within the office. No one has replied to my question about the missing material. I’ve sent the same email several times now, to several different email addresses, and still nothing. What could possibly be the meaning of this? 
(Edited)
Oh, perhaps I should clear things up a bit: By “a single one of my emails” I meant the emails about the missing materials. I only received ONE reply with regards to the issue that they wanted to talk to me about.
I’d read nothing into this, but I would call them to ask your question.
Call them!!!