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.

audiotest1.ogg & left_right_test.ogg are based on the song "Maybe" that shipped with the game Fallout 1. These files have been released by Interplay later under a license that permits you to copy and spread these files but without making profit of it!