Hi folks, I upgraded recently to 2.01 and noticed this bug while testing the app I'm working on. When adding/deleting a leaf to/from node at run time when the node is open, the same node duplicated with all the leafs appears beneath itself, all roll overs are also completely messed up. You should be able to experience it by using the code on the adobe website like I did at: http://www.adobe.com/devnet/flex/quickstart/working_with_tree/ Copy and paste the sample code of "Add and remove leaf nodes at run time". Please note that you will have to delete an extra double quote (detected by flex builder). Run the app, add an operation employee from the form below the tree. Result: The operation employee is added but the Operation node is cloned. Delete a leaf (employee) of the operation node or engineering node. Result: employee is deleted but the "operation" node is cloned. When you test the online example you don't have this bug as I believe it is compiled with v2.00. I have uninstall and reinstall FB 2 and the sample code run as expected. I hope it will be fixed quickly .. or is it just a problem with my laptop.

