Same problems on 1.6.35 Essential edition on Mac
Edit
...and more (i'm sorry to seem so unpleasant :S
When multiple images are dragged on stage at the same time, only the last of the list appears, although all slots are created in the tree. Yet the slider reveals the silhouettes of other items on the stage. All are red in the tree.
Because of that, create new bones is impossible : the image glue to the parent bone whereas its silhouette selection stay in place....
in brief, it's unusable for the moment.
Hope you will fix it easily and quickly
Regards
Spine Launcher 1.5.1-full
Mac OS X x86_64 10.6.8
Java 1.7.0-u6-unofficial Oracle Corporation
OpenJDK 64-Bit Server VM
Up to date: 1.6.35
Spine 1.6.35-full, JGLFW
ATI Technologies Inc.
ATI Radeon HD 4850 OpenGL Engine
2.1 ATI-1.6.36
Started.
Uncaught
lu: index must be >= -1 and < 0: 0
at com.badlogic.gdx.scenes.scene2d.ui.List.a(SourceFile:149)
at ie.b(SourceFile:283)
at id.a(SourceFile:81)
at gw.a(SourceFile:55)
at gq.a(SourceFile:165)
at gq.a(SourceFile:130)
at gy.a(SourceFile:277)
at m.a(SourceFile:88)
at be.a(SourceFile:81)
at ap.e(SourceFile:209)
at rh.e(SourceFile:155)
at au.run(SourceFile:187)
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)