Well, again I really doubt this is because of our plugin. As I tested it succesfully yesterday on latest Joomla and Jomsocial, both with a single user for friend and as 'Friend Party', and always with nocaptcha enabled.
Also other customers confirmed it is working.
Not shure why it only shows when our plugin is enabled, but this doesn't mean the plugin is guilty.
I would rather bet on a malformed url redirection stored in your redirections table:
ayaxn_redirect_links
If you can, make a simple easy test, backup your database first and empty this table.
Try the registrration workflow again and let me know if error message persists or other result.
- Need help? Post the URL of the related page (eventualy as confidential info), it will help solve your issue faster.
- An error, notice or warning? report the exact message including the line number
- If you get a white page , enable error reporting and / or check your server error logs.