Same problem here:
Spine Launcher 1.4.9-full
Licensed to: xxx
Mac OS X x86_64 10.8.4
Java 1.7.0-u6-unofficial Oracle Corporation
OpenJDK 64-Bit Server VM
Up to date: 1.5.10
Spine 1.5.10-full, JGLFW
ATI Technologies Inc.
AMD Radeon HD 6750M OpenGL Engine
2.1 ATI-1.8.18
Started.
Uncaught
java.lang.ArrayIndexOutOfBoundsException: 0
at aoj.a(SourceFile:739)
at aoj.a(SourceFile:651)
at qh.c(SourceFile:452)
at qh.a(SourceFile:303)
at qh.D(SourceFile:269)
at alr.run(SourceFile:165)
at xo.a(SourceFile:1173)
at alq.a(SourceFile:153)
at ip.a(SourceFile:28)
at fz.a(SourceFile:167)
at fz.a(SourceFile:132)
at com.badlogic.gdx.scenes.scene2d.ui.Button.b(SourceFile:117)
at gz.b(SourceFile:90)
at ir.b(SourceFile:82)
at gf.a(SourceFile:57)
at gh.b(SourceFile:329)
at l.b(SourceFile:94)
at bc.b(SourceFile:70)
at an.e(SourceFile:202)
at qg.e(SourceFile:157)
at as.run(SourceFile:172)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:711)
at java.awt.EventQueue.access$000(EventQueue.java:104)
at java.awt.EventQueue$3.run(EventQueue.java:672)
at java.awt.EventQueue$3.run(EventQueue.java:670)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:681)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:244)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:163)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:147)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:139)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:97)