CSS will not save in WP customizr after latest theme update

Hello,

After updating WP to 4.8 and the latest Customizr update, when I used the customizer to add CSS, “Save and Publish”, the button does not indicate “SAVED” nor does it register as saved.
When I exit, the “leaving this page” box displays…

Oddly tho – when I go back to it, the changes I made DID take.

I don’t get any javascript error within the developer tools console…

Hope this can be fixed…
thank you –

Jackie