Here's my setup:
- WordPress 3.4.1
- Plugin version 3.1.2
- Single-site setup
I have things configured such that the admin is entirely secured, and I have a valid SSL certificate installed. Things work beautifully on the admin side until I try to view a post or the front page of the site.
I let my site load in HTTP (vs HTTPS) just because that's the way I always have. The SSL cert is only used for payment forms, login forms, and the admin. But when I'm logged in and I view the HTTP version of the front-end of the site, I'm automatically logged out.