I encountered the redirect loop issue that a few people were having when forcing SSL. I have SSL forced using Better WP Security for my entire site, and when PMP was activated, a redirect loop occurred.
I did manage to fix this though, by opening up the /includes/https.php in your plugin, and uncommenting the pmpro_besecure_set() function.
Let me know if you foresee this causing any issues.
If not, feel free to mark this as resolved. Just wanted to let people know a potential fix.