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Thought I would follow-up.... I downloaded the file that link lead me to. I followed the instructions. On 2.0.18.1 that hack kills the registration. 1)The captcha is almost 100% impossible to read. (The friggin' background is jumbled letters and numbers. How stupid is THAT?) 2) White screen on submit.
Luckily it is easy to undo. 2 core files to replace and it's back to normal. (unprotected, but functional.)
I was all happy thinking I would have captcha protected registration on those sites. Oh well. I will just continue deleting bots, or whatever they are I guess. I upgraded the 2.3.3 site to 2.4.1 so maybe that will stop it, but I was getting those registrations with the 2.3.3 registration captcha on that site as well.
I don't know what to do about this.
