recaptcha ssl problem
I'll look at this problem and if it's specific to your reverse proxy situation, I'll ask you for a VPS.
I have the same problem of not seeing the recaptcha image, and it happens also on a non-SSL server. Tested on Iceweasel 17; I'm getting CSP WARN in Firebug, so the image is blocked by content security policy.
fix by sanasol.ws
The proposed fix lowers security. This fix should be ok, please confirm: