Was about to try the manual update, but I noticed v10 is out today… updated via the admin and this seems to have worked fine, although 9.7 did for a few days as well… will post back if things change
Confirming the same issue; WP 5.1, Yoast 9.7
Updated the WP install and the plugin a several days ago, and everything was working fine. Then last Friday I abruptly started getting a 500 in the admin area.
The error is: PHP Fatal error: Uncaught Error: Class ‘WPSEO_MyYoast_Proxy’ not found in /[redacted]/wp-content/plugins/wordpress-seo/admin/class-admin.php:113
Disabling the plugin eliminates the error. However, we need to be able to use the plugin.
Although this is likely unrelated, I will mention that I first noticed the error after pushing a testing file to the server (containing a call to phpinfo()). However, even after removing that file I still get a 500 error when I enable Yoast
