I think I solved the mystery I was seeing on MT.Net, so now I can tell you what happened.
I’m using the SABRE WordPress plugin to block bot users from wreaking havoc on the MT.Net blogosphere. Earlier this week, a supposed bot passed the SABRE math test, so I decided to crank up the CAPTCHA feature of SABRE to further weed out bots. (Now, I don’t know if it actually was a bot that registered or simply some bored Russian, but I wanted to see what the CAPTCHA did anyway.)
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