Didn't see anything here, so I googled around and found this on linuxquestions.org:
So I did the same, all seems well and I am writing this from my new system. My question is, did I somehow miss installing the console policy kit package? or is this a bug in the xinitrc?@linus: I think it's because by default it tries to run with consolekit/policykit and you are probably missing them in your install: you can try modifying line 134 of /etc/X11/xinit/xinitrc.xfce deleting the ck-launch-session command (but leave there the $xfcesm).
you can also copy it to your home as ~/.xinitrc and edit that copy if you need it for one user only.
I don't know if you will miss any functionality not running if in a policykit session: I'm not a xfce user, you know it surely better than me, so you will discover if something is missing trying