Simple Membership Plugins Not Working

I have a simple site with 2 pages that require logins. I initially setup Simple Membership plugin and it was working flawless. I don’t know what happened, but it stopped working and it always redirects people to Log-In again.

I have tried other membership plugins, and they all do the same thing. They work once. Then after the user logs out, they stay protected. If I edit the page and simply update the settings, that page will work again until the first user logs in, accesses it (works fine once) then logs out. Then that page will not load again, until I re-edit it.

This happens no matter which membership plugin I’m using, I tried Members, WP-Members, and Simple Membership.

I will give you guys a test login if anyone wants to help troubleshoot and see this bizarre behavior. I really don’t want to rebuild the site.