Sharepoint 2010 Javascript error on trying to add webpart to custom page

I deployed a custom page and when I edit it, trying to add a webpart, I get the following javascript error:

Message: 'this._cats[...]' is null or not an object Li开发者_开发百科ne: 2 Char: 3404 Code: 0 URI: http://devpn-004:2010/_layouts/wpadder.js?rev=hnGJJEMcU5XH%2BCq7PlSxJw%3D%3D (not a valid link 2013-12-09)

A fresh reinstall of Sharepoint 2010 fixed this issue.