compojure resources problem between 0.5.2 and 0.6.0

gistfile1.clj

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;;/login.html (a static resource) does not work in [compojure "0.6.0-RC4"]
;;however, the simple GET works fine
;; 2011-02-12 08:03:25.840:WARN::/login.html
;; java.lang.NullPointerException
;; 	at ring.middleware.session$wrap_session$fn__3069.invoke(session.clj:47)
;; 	at ring.middleware.cookies$wrap_cookies$fn__3009.invoke(cookies.clj:132)
;; 	at clojure.lang.Var.invoke(Var.java:365)
;; 	at ring.adapter.jetty$proxy_handler$fn__2063.invoke(jetty.clj:16)
;;
(ns grr
  (:use compojure.core
        [ring.adapter.jetty :only [run-jetty]])
  
  (:require
   (compojure [route :as route]
              [handler :as handler])))

(defroutes my-routes
  (GET "/grr" [] "grr")
  (route/resources "/" {:root "/dev_public"}))

(def app (-> my-routes
             handler/site
             ))

(defonce *server*
  (run-jetty #'app {:port 4567 :join? false}))

For the record: James Reeves found the error; there shouldn't be a prefix slash on (route/resources {:root "/dev_public"}).
This slash was automatically removed by compojure 0.5.2, but not 0.6.0.