Yes, it doesn't appear to be a video driver problem.  I think it's a java linking problem.  Java is in turmoil on the Mac these days.

Hi I love MULE!  I was on the airplane and tried to play with my daughter after a hiatus and it didn't work in play local mode.

As best as I can tell, it is a problem with the liblwjdl that comes bundled with mule app.  I think it's a java 1.6 version.
When I try and run the java command line in the mule.app package Info.plist I get this error:

$ java -Xms64m -Xmx256m -Djava.library.path=lib -jar data.jar
_NSJVMLoadLibrary: NSAddLibrary failed for /libjawt.dylib
JavaVM FATAL: lookup of function JAWT_GetAWT failed. Exit

Here is my log_init.txt

$ more Resources/Java/data/log_init.txt
  INFO [Properties.<init>]                           VERSION: 1.3.6
  INFO [Properties.<init>]                           Classpath: data.jar
  INFO [Properties.<init>]                           Java VM: 23.7-b01
  INFO [Properties.<init>]                           Java Runtime: 1.7.0_13-b20
  INFO [Properties.<init>]                           OS: Mac OS X 10.8.3 x86_64
  INFO [Properties.<init>]                           Java Library Path: lib
  INFO [Properties.<init>]                           Max Memory: 238616576
  INFO [Properties.<init>]                           Avaialble Processors: 8
  INFO [PropertiesBase.readFromFile]                 Reading Settings from file settings.txt
  INFO [Settings.<init>]                             Settings file not found: settings.txt (No such file or directory)
  INFO [SubstanceLoader.initLookAndFeel]             Window Skin: Default
  INFO [Main.main]                                   lpSolve: 5.5 Release 0 Build 15
  INFO [SoundPlayer.initialize]                      Initializing Sound System
  INFO [SlickLogSystem.info]                         Initialising sounds..
  INFO [SlickLogSystem.info]                         - Sound works
  INFO [SlickLogSystem.info]                         - 64 OpenAL source available
  INFO [SlickLogSystem.info]                         - Sounds source generated

I'd love to be able to play with my kids next time!
Thanks!