[Smush Pro] Divi logo failing to load when using Smush CDN

The logos on several of my sites are failing to load.

On hunch I disabled the CDN function of the Smush plugin on one of my sites and this fixed the problem.

The site is built using Divi. I'm not sure if this is a Divi issue, or a Smush issue.

Is this a known issue? Is there anything I can do about it? I'd like to continue using smush CDN.

Thanks for your input. – Tom