Ok, I did some testing on an older staging server, which as luck would have it; there was an earlier version of All-in-One WP Security installed (version 4.3.8.3). That version worked correctly every time I tested it.
I tested the older version by toggling each plugin off; then trying to register a new account leaving the Math Captcha unsolved. Each time the the registration failed as expected.
I next updated All-in-One WP Security to the current version (v4.3.9.4), then went through all the site’s plugins and themes, testing each of them by toggling them off and trying to register and new account.
Each time I left the Math Captcha empty, and each time I was able to register an account in spite of the unsolved Math Captcha.
So I don’t think this is a plugin conflict. Sometime after version 4.3.8.3 the Math Captcha stopped working.
I hope this information is helpful, and you’ll be able to patch this soon. Thanks for looking into this problem
Update:
I grabbed a copy of the older version of All-in-One WP Security and installed it on the live site, and now the Math Captcha is working.
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This reply was modified 5 years, 9 months ago by
scottm-ldg. Reason: edited for clarity
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This reply was modified 5 years, 9 months ago by
scottm-ldg.
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This reply was modified 5 years, 9 months ago by
scottm-ldg.
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This reply was modified 5 years, 9 months ago by
scottm-ldg.