In our latest development we need to keep in buffer (ob_start) all footer content. But after activating SEO WordPress stopped working.
Making a small modification to the file: wordpress-seo/frontend/class-frontend.php
@ 102: - Add_action ('wp_footer', array ($ this, 'flush_cache')); + add_action ('wp_footer', array ($ this, 'flush_cache'), -1);
The problem is solved, and I think it does not interfere with the operation of WordPress SEO.
So be free to use on wp_footer actions. Otherwise buffer are blocked by the SEO WordPress itself.
Is it possible to add the "-1" in the original code? Thank you!