Bug fix. It turned out the instance tree contained ghost instances, since InstanceTree.removeInstance sometimes failed. This caused those random crashes in UH. Now the InstanceTree enforces that remove/add Instance work in pairs. A new Exception is raised in case this ever goes wrong again. (InconsitencyDetected) Furthermore the removeInstancheChangeListener stuff had a fix to become reentrant. It is not clear wether this was shadowed by the aforementioned bug or was never triggered.

--- a/engine/core/model/structures/instancetree.h	Mon Aug 24 16:06:30 2009 +0000
+++ b/engine/core/model/structures/instancetree.h	Mon Aug 24 18:32:03 2009 +0000
@@ -94,7 +94,7 @@
 
 	private:
 		InstanceQuadTree m_tree;
-
+		std::map<Instance*,InstanceTreeNode*> m_reverse;
 	};
 
 }