Can’t Save Options (Shield WordPress Security)

If you use the plugin  Shield WordPress Security (formerly WordPress Simple Firewall), or WordPress Firewall 2 you may encounter the "white screen of death" when trying to save WP Rocket settings.  Depending on your plugin settings, you may also find that you get redirected to your homepage when trying to save or update WP Rocket options. 


For both plugins, this is resolved by checking "ignore administrators" in the settings: