URL Groups don't work as they should

I'm struggling with this plugin in so many ways.

The latest problem I have is with URL groups.

I have created several groups of URLs and then created positive rules for an access level to see URLs contained in those URL Groups. Sounds straight forward, right?

Let's say I want Access Level Premium to have access to multiple URL Groups. I simply check the boxes next to the URL Groups in the positive rules panel for that access level, right? Wrong.

Unless the URL is contained in ALL the URL groups that my access level has checked, it will not be available to that user.

Or, to put it another way; if Premium User has access to URL groups 1-13, unless that URL is in ALL 13 groups, he wont get access to that URL. This is nuts! It defeats the purpose of grouping URLs.

Am I missing something or is this bug?