After a couple of days of trying to solve this myself, I am at a loss I'm afraid!
I am using Bootstrap Select2 plugin with dynamic dropdowns (which normally work fine by the way).
With a 'normal' select control, all is fine and the Set Selected in List function works great.
But - with a Select2 control, the selected option is indeed selected (I can see that in the dropdown list) but it does not populate the input box - it just shows as (blue) selected in the dropdown list and the input box still shows the placeholder (or the first static option)
I just wonder if you have come across this and if you have any ideas as to why?