Membership plugin content restrictions not working for any level

Hi,

I have Wordpress 3.0.4 and Membership plugin 1.0.5. I configured three different membership levels including one for stranger. But no matter whether I'm logged in with the premium subscription or not logged in at all I see all the content despite specific positive or negative rules I set up on specific posts/categories etc. I must be missing some master switch on allowing the plugin to control content. Does anyone know what I might be missing? I'm using the default twentyten theme.

Thank you!