I am trying that the avatar in profile show the humbnail (as in the userlist) and when you click in a lightbox (or a simple link) show the full image.

Did I miss something? I have spent 3 days dealing with the
$oReturn = $this->_avatarHtml( $field, $user, $reason, $thumbnail, 2 );

On cb.core.php

¿Where should I look to change this behavior?

Thanks