mdvmarco

Same problem with plugin and SSL. If “force SSL exclusively” is activated (any page that is not secured via Force SSL or URL Filters will be redirected to HTTP) plugin don’t works. I’m waiting a plugin update ??

This is a compatibility problem.
You can try to disable buddypress registration

Insert below code in your theme funtion.php

// Disable Buddypress registration

remove_action( 'bp_init', 'bp_core_wpsignup_redirect' );