HI, Just so it's clear.
In Apache Flex 4.9.1 - this code gives an RTE. a.sort = null; a.addItem({...}); And with this code. Items are still sorted after refresh when they shouldn't be. a.sort = null; a.refresh(); a.addItem({...}); The fix I applied for FLEX-16857 "fixes" both of these issues. ie no RTE in case one and item are unsorted in case two. Thanks, Justin