User can't register to VM site

[Magev88]

Hello,
i have a Joomla 3.3 site with VM 3.0.4 and i have a problem with the user registration.

When i insert all the required fields and i press the Register button, it like redirect me to the user edit page and registration is not concluded.. no mail, nothing. Why?

Live site: www.idea-s.it/rocks

Thanks

[GJC Web Design]

and with the std. protostar template?

[Magev88]

The same, i will redirect to the edit user page... and i have also this error:

PLG_RECAPTCHA_ERROR_INCORRECT_CAPTCHA_SOL

[Magev88]

With this kind of error i have climbed to this post that have resolve my issue: http://forum.virtuemart.net/index.php?topic=124559.0

Was the CAPCHA plugin turned on that create problem!! 
Thanks for support so 

[Magev88]

I'm so sorry to say that I'M NOT RESOLVE te issue 
Because, with my VM 3.0.4 version, when i try to update or change some user fields (for user registration) registration stop working, and user, when have finished to compile all the fields, is redirect to the edit account page, without register. I also try to change the user fields by phpmyadmin directly, but the situation is the same, form workin only with the native vm userfields, if i insert another field or modify existing one, it stop working.

Can this is a bug?