Hello, I'v got the same problem

"Session expired or cookies are not enabled in your browser. Please press "reload page" in your browser, and enable cookies in your browser. Please refresh/reload page before filling-in."
(in french it is "La session a expiré ou les cookies ne sont pas activés par votre navigateur. Veuillez cliquer sur "Actualiser" et vous assurer d'avoir bien activé les cookies dans votre navigateur.")

_UE_ENABLESPOOFCHECK is set on "NO" (Enable anti-spoofing sessions checks set this to No.)

And I don't have a 3rd party module to register.

Here is the registration page www.aloha-coaching.fr/creer-un-compte
I'm under J1.5.22, CB 1.4 and CBSubs 1.1.2
Thanks
Matt