Cannot add a new category

[codinghorror (Jeff Atwood)]

Unable to create categories

I am unable to create a category. Whenever I go press, new category, it just shows up like this: The only unusual thing about my install is that I am using SSO. My installation is at https://github.com/discourse/discourse/commit/3d30bd115ddeb988d6e0418960c0e9a7c5fa84a9 Any help would be appreciated. Can provide whatever information is needed.