Sorry- hit the button before I entered the problem!
I have an issue of one or sometimes two items (of two) in the render list that can't be deleted.
When I fire up the SU model I get a message saying a component definition was erased from the model.
On the render list tab, (variably) ticking the box and delete = no change or removes one item on a refresh of the list; Skatter does ask for confirmation of deletion. On a couple of occasions this has resulted in a bugsplat (not constant). Unfortunately nothing in the console to indicate an error. There is a potential connection with the automatically deleted component and the non-erased render setup though.