I have been a user of xmonad for a few months now on Linux, and I thought I would try to bring the tile based sweetness over to my OSX machine.  So I fired up X11, followed the tutorial on the Haskell Wiki and got a generally usable setup.

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The linux version sets the focused window to have a green border and the rest of the windows to have a red border.  When I use this on OSX, I can sometimes get a red border to partially show up around one of the terminals by resizing it, but I never get the focused green border.  Is there some setting I am missing or is there something I need to do differently with OSX X11?