Hello Paul Brun,
Are both of the scenarios not consistently reproducible? Can you provide us some code fragments so we can patch a repro project? If this is not possible, can you elaborate little bit more on the context: is the tree data bound or virtualized; have you changed the control template; are you using data templates or edit data templates; which events have you registered to; are you handling some events (e.Handeled = true)?
The described scenarios below make me think some code is "stealing" the focus. This could be the reason for improper edit mode behavior.
Please let us know if you need more help or progress with the issue.
the Telerik team
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