[Plugin: Better WP Security] Permission Denied for Password Reset Link

When i open a password reset link from an E-Mail, i always get the Error that permission was denied. I figured out, that it works when i’m logged in at another tab, what doesn’t really makes sense to me. All other pages like the login-slug are working great.

http://wordpress.org/extend/plugins/better-wp-security/

Thanks for the attention.