Dear people having issues in this thread, please help me test something. Edit All In One SEO Pack; in version 2.2.1 you’ll see two lines, starting at line 136 – comment out one and uncomment the other. Currently they look like this:
add_action( 'init', 'aioseop_load_modules', 1 );
//add_action( 'after_setup_theme', 'aioseop_load_modules' );
Change it so they look like this:
//add_action( 'init', 'aioseop_load_modules', 1 );
add_action( 'after_setup_theme', 'aioseop_load_modules' );
And let me know if that fixes your issue, or indeed has any effect on it at all.
Also, if you’re running 2.1.7 this should already be done, but you could replace the one line with the other and see if it exhibits the same behavior as 2.2.1 – though really what I’m trying to do here is fix 2.2.1 for you. ??