Hi,
I have the same error.
I can’t switch between the text and visual editor when WordPress SEO is active. I have to deactivate WordPress SEO before I can make a switch.
I have Yoast SEO 9.0.3 and WordPress version 4.9.8 installed.
Nothing is working at my forms. They don’t even show errors. They are not showing labels etc. the fields are there, but is undefined.
you can install this plugin, that will redirect all subdmains.
http://wordpress.org/plugins/redirect-from-cdn/
edit: My bad… maby I read your post wrong. you shold probably go with “billynair” on this.