Hi there,
Check the stickie above \"Mac Client Status.\" When 0.3.013 is available for Mac, run the Updater programs, and you\'ll be good to go.
EDIT: I just realized that\'s not your only problem. I take it you are trying to run the standard Updater. Go to the stickie labeled \"READ BEFORE POSTING: A Guide to Running Planeshift on Mac OS X\" and download from it either one of the Java updaters (Updater.jar or Updater-old.jar, depending on your operating system). When 0.3.013 is available for Mac, run the Java Updater. This may even fix your standard Updater.
Good Luck!