WP better security and Multi site privacy compatibility issues

Due to large amounts of spam bots hitting my login page I was force to change the login URL. I did this using WP better Security:
http://wordpress.org/plugins/better-wp-security/

I already fixed some compatibility problems with the multi site privacy plugin but now I'm stuck.

When I activate wp better security (even without the login rename function), visit a password protected blog, insert the correct password I get the error "ERROR: The username field is empty.". I checked in code and the plugin should catch this error and ignore it, but in some way the wp better security plugins kills this.

I also noticed when I activate wp better security that the "Authorization Required: This blog requires a password to view it." text is removed above the login box.

If I get these two plugins to work, I'll be more than happy to share my solution.

Any help is appreciated.

Cheers,
Pieter