I installed Facebook Ultimate and was receiving errors when attempting to register/log in which said
"Unable to load the registration form for Lecture Exchange. You may have previously blocked this app on Facebook. Go to your Facebook privacy settings to unblock this app. (Error: Missing 'redirect_uri' query parameter.)
when i updated membership the facebook login started working but every page except "Register" and "Account" return the message
"Fatal error: call to undefined function mb_stripos() in ...membershipincludesincludesfunctions/php on line 1082"
This message was not encountered when viewing the site in admin view (but did generate the same error on every page expect Register and Account when not signed in to wordpress or when viewing the site as the access level set for "Stranger Settings"
I deselected "Registration page" and "Account page" on the Membership Pages tab of the Membership Options, and created a new membership level. viewing the site in this new access level (which i set to the default for non-registered visitors to the site) eliminated the occurrence of the fatal error message BUT the facebook login in error now occurs AND on the registration page showing the error, all of the names of all of the protected pages of my site are shown in the main navigation bar.
My php version is 5.4.21 using Zend Engine v2.4.0. Multibyte support is not enabled.
Before installing Facebook Ultimate and updating Membership Premium, Membership Premium and the site generally were functioning properly.