This turned out to be it. I saw your other post about changed signature key and added the custom script for the new signature and it worked. Thanks for your help!
I'm having some really weird DNS issues that I can't figure out, which is driving me insane (and also with shame, seeing as how networking is part of my job). So I want to see if anyone can think of something that I'm missing.
The problem: DNS queries for many (but not all) sites, including...