I have a test site:
http://ahhowland.com/rtc/

I have installed Role Scoper Version 1.2.8.RC9.c. I have set the "Member's Only" page in the nav menu to be restricted to a "subscriber." However, the link is still appearing even if someone is not a "subscriber." It is properly restricting access and giving them a 404 if they click on the link. Is this because Role Scoper does not play nice with Thesis?

To block a page from all other users (even for front end access), edit the page in question and check the restrict checkbox for Readers, Contributors and Editors. This is necessary because Editors, etc. because the Reader role is "contained" in the Editor role based on the respective capability sets.

After setting those restrictions, assign the Reader role to group [WP Subscriber].