I’ve been having a nightmare trying to get the Cloudflare plugin for wordpress to play nicely. After installing it I found that I had a blank settings page when I tried to enter my API details. I tried setting Cloudflare into development mode & also pausing Cloudflare but still the settings page wouldn’t load.
I started searching online for a solution and there seemed to be solutions for loads of older versions, but nothing about the current 3.0.3 plugin. After successfully getting the plugin to run on various other copies of wordpress on the same server I started to look at the config of the problematic blog. The only thing that differs on this site, compared to my others, is the level of security I have set. I quickly discovered that the All In One security plugin (also known as WP security) was stopping the Cloudflare settings page from loading. Simply disabling the WP All In One Security plugin allowed me to load the cloudflare wordpress plugin and get around the blank grey settings screen.