Bug 882 - Crash on OSX when closing NEWT window - Check JavaVM and JNIEnv handles before usage in NewtMacWindow (Not the culprit .. but more safe)
Bug 882 - Crash on OSX when closing NEWT window - Fix: Release NewtMacWindow  manually in close0()

Release NewtMacWindow  manually in close0()
  - Mark [NewtMacWindow setReleasedWhenClosed: NO] in init0(..)
  - Release NewtMacWindow manually in close0(..)

Check pointer args in close0(..)
Bug 881 - Add 'Application-Name' in Jar's manifest to avoid Java6 NPEs ..