hide for registered users doens't work

when I set the option to “Hide the CAPTCHA for registered users (even without any capabilities).” and I logged in my site and try to send via contact then I get an error message that there is a problem with the validation, check the fields again. When i logged out and try it with the capatcha there isn’t a problem to send… what could be the problem?

http://wordpress.org/plugins/contact-form-7-bwp-recaptcha-extension/