Hello Frank,
Really appreciate you responding back.
Later on I will deactivate all plugins except AO and leave just the CSS Option box checked, as well use a different WordPress theme. I'll see what happens and get back to you.
I'm using the W3 Total Cache plugin with Cloudflare as a CDN network, so I'll pause Cloudflare as well.
The way my site is setup now it passes the Google Mobile-Friendly Test with CSS Option unchecked.
Philip