Protect sidebar content with Membership plugin?

Forgive me if this has been covered somewhere here that I haven't found yet.

I'm using the Membership plugin RC3 (will update to 1.0 as soon as I can) and want to protect sidebar content. I've tried shortcodes, but they're visible even when not logged in as a member (shortcodes are set to be protected by default).

How do I do that?