Working with a rigged character that has had no other issues when using the constraints and adjusting the weights or the positive, when now trying to work with it, the program crashes.

Any ideas?

Here is the following crash report:

Spine Launcher 1.9.00-full
Windows 7 x86 6.1
Java 1.7.0-u6-unofficial Oracle Corporation
OpenJDK Server VM
Up to date: 2.0.21
Licensed to:
Spine 2.0.21 Professional, LWJGL
Intel
Intel(R) HD Graphics Family
3.1.0 - Build 8.15.10.2476
Started.
An unexpected error has occurred:
hc: #iterator() cannot be used nested.
at gN.hasNext(SourceFile:525)
at oM.d(SourceFile:531)
at oO.run(SourceFile:86)
at ad.e(SourceFile:246)
at ah.run(SourceFile:221)
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)