I get the same error on a non-wordpress site. The odd thing is that it only happens with PNG images. Is the same thing happening to you?
I can’t find any docs on the API errors from Pinterest.
I got this JSON response from the PinIt plugin page.
“resource_response”: {“data”: null, “error”: {“api_error_code”: 234, “message”: “We’re having some trouble talking to <myurlgoeshere>. Please try again later!”, “code”: “API_ERROR”, “target”: “<webapp.resources.pin_resource.PinResource object at 0x141dde50>”, “http_status”: 408}