I've since upgraded to Restrict Content Pro, and am finding similar problems with the "Restrict this content" section. I've deactivated all plugins except for Jetpack and Restrict Content Pro, but it's still happening on just a couple pages. I'll check "paid only," set the access level via dropdown, and then check the boxes of the subscription levels I want to give access to. Then I set user level to "subscriber" and click update, after which all of the check boxes go blank and the drop-downs revert to default status.
Is there somewhere in the database where these values are stored? I looked through every table, hoping I could set the triggers in phpMyAdmin, but didn't find anything that seemed obviously corresponding to those subscription levels.
I'm a bit concerned because the 4 or 5 pages that won't retain those protection settings then allow access in to the whole membership section if someone can find those pages.
Thanks in advance for your help!