[Plugin: Exclusive Content Password Protect] Won't lock separate pages / posts

The Plugin: Exclusive Content Password Protect (using version 1.1.0) is working fine when I use only one password protected page.

However, when I try to set a different password on a post, it only locks the content for users who have not entered another password on another other page. (and by this I do not mean the “global password”).

Once someone has entered “a” correct password on any page or post, the rest of the pages and posts are “unlocked”.

I guess this has something to do with cookie-processing:
whenever one correct password is provided once, I can see that also a cookie containing the “global password” is stored for this user.
(Firefox and IE)