Captcha as used in Phatform, at least, acts differently when the site is a branch site. No image is displayed. The box to enter the captcha text is displayed as usual. However, no text is required and an anonymous user can proceed without having to enter captcha text.
Have not tested captchas in other modules when used in branches.
In case it helps, here is the phpinfo for one location where this is failing. http://primail.org/phpinfo.php
Regards, Andrew P.
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