That looks like a problem with the LibGDX framework on OSX specifically. I’ll look more into it and go see if it runs on my Mac. Could you tell me the version of Java you’re using, and what version of OSX you are running?
Edit: Yep, it’s not running at all on my Mac. I’ll look on the LibGDX forums and try to figure out what’s happening.
Edit II: After doing some quick research, “LWJGL is completely broken under OSX Java 7, and needs a ground-up rewrite of the Display implementation.” But that is a quote from 2012, and the issues seems to be that LibGDX doesn’t use the latest version of LWJGL, so the issues still exist. I’ll try to see if I can put a newer version of LWJGL in LibGDX and see if it fixes anything.