I've got the following error:
"Unable to communicate with CloudFlare API: Setting: devmode Invalid domain provided.."
Fresh W3 Total Cache install on new WP 3.8.1 website on Hostgator shared.
Firstly Cloudlfare was enabled through Cloudflare dashboard, later on I changed back the nameservers to Hostgator, deleted my site on Cloudflare admin and enabled Cloudflare on Hostgator cpanel. This message still exist from Cloudflare enabled admin to Hostgator enabled, too.