I'm on phone with GD right now. They're working on it, talking about making a user on my site to replicate the issue.
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Now mine magically works again.
They said they haven't changed anything server-side since October. He said that it must be something with vBulletin's servers. After I told him that these are standalone installations non-reliant on vbulletin.com (that's correct, correct?), he was stumped.
But now everything works. *shrug*
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