This bug has now been solved in the Apache Flex SDK, and will be available in the next version (probably 4.14). For details see [FLEX-34119] https://issues.apache.org/jira/browse/FLEX-34119 [FLEX-34119] mx.collections.HierarchicalCollectionViewCursor... https://issues.apache.org/jira/browse/FLEX-34119 Steps to reproduce A: Run the HierarchicalCollectionViewCursor_FLEX_34119_Test unit test. You should see lots of "Bookmark no longer valid" errors. Steps to reproduce B: Run the attached AIR project.
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