You are missing resources (styles) for the editor. JSF loads resources when they are needed, unfortunately in the case of editor they are needed before JSF thinks they are.
The solution is to place an invisible editor on your page (ideally inside a template) which will force JSF to load the necessary resources.
<rich:editor style="display: none" />
I also suggest you to upgrade to RichFaces 4.3.5.Final.