I just uploaded new version of the server (1.4.0-apple14). It uses mach IPC to start the server rather than exec(). This will help us be more OSX-paradigm friendly in that there should now never be two instances of the process running at the same time. Please test it out (and keep your 1.4.0-apple13 binary (from 2.3.0-rc3) handy). I've noticed that it seems a bit "sluggish" to startup, and I'm not exactly sure why that is, but any feedback would be greatly appreciated. This should do the trick of installing the update: wget http://xquartz.macosforge.org/downloads/X11-1.4.0-apple14.bz2 wget http://xquartz.macosforge.org/downloads/Xquartz-1.4.0-apple14.bz2 bunzip2 X11-1.4.0-apple14.bz2 bunzip2 Xquartz-1.4.0-apple14.bz2 sudo mv /usr/X11/bin/Xquartz /usr/X11/bin/Xquartz.bak sudo mv /Applications/Utilities/X11.app/Contents/MacOS/X11 / Applications/Utilities/X11.app/Contents/MacOS/X11.bak sudo cp Xquartz-1.4.0-apple14 /usr/X11/bin/Xquartz sudo cp X11-1.4.0-apple14 /Applications/Utilities/X11.app/Contents/ MacOS/X11 Thanks, Jeremy