Thanks for the update and I totally understand! I actually have two professional references and one academic and the academic one has been the biggest pain to get any communication on. When I initially asked, my professor didn't respond to my email, but then responded to me wishing her Happy Bday on Facebook. (Technology makes life weird.) So she said she would write the letter but when I sent her all my info (statement of purpose, resume) she hasn't responded. I realize I have almost two months until the first deadline (Dec.1) but I'm also worried she'll flake out last minute and then I'll only have two letters. It's a common worry, I think, and yes, definitely the most frustrating part of applying. But I also understand that professors probably get asked for a TON of letters and that's in addition to grading, teaching, their own research.