The Gutenberg – Cloudflare (free) – “Fix” This is what worked for me. We have the free version of Cloudflare. WordPress 4.9.8, and Gutenberg 3.4.0 Go to your Cloudflare Firewall page Scroll down and select Web Application Firewall. Look forr those nasty BLOCKED actions. Click on the Details…. IP redacted… in the left dropdown box, select whitelist, and be sure to CLICK THE CHECKMARK! You will need to do this for EACH IP.