Guess I haven’t done any work from home since I updated to Mountain Lion. When I went to start up X11, I was greeted with:
Clicking continue, brings you to here. Not only is it not installed, but its not directly supported by Apple any more either.
One 66.9Mb download and log out (well, I restarted to clear some other updates while I was at it) and it looks like I’m in business.