Not saving settings within pages/posts again

https://wordpress.org/support/topic/not-saving-any-setting/

The above topic has been closed, but I am still experiencing what the previous users were describing with “Validating CSS, please wait…” with a continuously looping circle. Always saves the CSS, but never actually applies it to the page.

I have the most recent version of the plugin.

Can someone please help.

Thanks.