Multi-selects are weird. I've definitely seen things like this before, where rules to set a value don't work as anticipated. I'm not at all sure why this works on create and not edit ... I would probably drag the field bound to the multi-select onto the form as a bulleted list & see what data source looks like in create vs edit. I did this, and what I found was that the repeating field contains a single blank instance on create, but not on edit. So, if nothing is selected on create, when the form is re-opened, there is no node to set until you select an item in the list box. I'm not sure about a work around - I'd probably add an option that is selected on load, and then in the form, modify the list box to hide that option - then you always have a node you can set....
Hilary Stoupa
