Lightroom :: 4 - Map Module Is Blank

I upgraded from LR3 to LR4 yesterday and was excited to dive into the Map module. Unfortunately, the map seems to be blank. I have selected an image with GPS information. The Map module correctly looks up the location of the photo (Magdalena, New Mexico). This seems like a rendering bug.
 
Just to check, I installed LR4 onto another OS X 10.6.8 machine that had not previously had Lightroom and imported the same picture. The Map module worked correctly. So, I tried re-installing LR4 on the original machine. Unfortunately, it still does not work. I tried creating a new catalog and backing up and then deleting all preferences. The map is still blank...

I am open to all sorts of alternatives, including but not limited to: Running dtrace to look at library callsattaching XCode to debug (though I would assume all the objects have been stripped), or Starting up a WebDialogs/WebEx/VNC/TeamViewer/etc server for a dev to pry around on it or debug with XCode. Of course a debuggable build would work with this.  

I created a new user on the system that is failing, started LR4, created a new catalog, imported the test photo, changed to Map module--still blank. Something on this particular system is causing the rendering failure. My next thought was that perhaps it was an issue with the non-accelerated graphics. So I disabled the graphics switching. Still a blank map..