Works beautifully except now I have acquired a sudden problem with the "Hang Out" interaction. It works but after a minute or so the non-controllable Sim gets up and wanders off. Surely this is not related?
That is most likely unrelated. I've had that happen often. Maybe the non-controllable's sims needs are in the red. Sims are weird creatures that are slaves to their needs and often prone to doing stupid stuff.
Ste