I'm getting the following PHP errors and Yoast SEO is no longer working.
This happened around the 3.7 upgrade, although there has been a PHP upgrade to 5.4 also around the same time, so I'm not sure which one caused Yoast to fail.
From the error log:
[06-Nov-2013 22:34:37 UTC] PHP Warning: Creating default object from empty value in /home/<mypath>/public_html/wp-content/plugins/wordpress-seo/frontend/class-frontend.php on line 406
I'm using the latest version of the plug-in (1.4.19) - any suggestions welcome.