I also encountered problem with rich:editor, some time it displayed and some time it did not display...
I browsed the richfaces showcase, I found the same problem when I switched the tabs...
Hey, dostybear, the only manipulation with config what RichFaces do is placing it in appropriate constructor of CKEditor.
It does mean that if they are bugs with configuration, it's either the syntax of config (in most cases discoverable by looking into dev tools error console) or bug in CKEditor (which should be reproducible on vanilla CKEditor).
could you please provide us with more info on browser you have used and operation system?
I haven't seen such issues before neither it has been reported.