selecting categories does not protect posts

Selecting "categories" under the negative rule does not protect my posts. It only protects the categories page.

Since I have over 100 posts, and the "negative" selection area only shows 25, I cannot protect my posts individually so they are all public.

Several others have posted this problem in support, but I have not found any suggestions on to how to fix it.

I have WP Membership Premium 2.04 and WP 3.1.2.

P.S. Yes, WP Membership is enabled. Yes, my levels are active.

Any ideas on how to fix this?