Thanks @Petra. Yes, I am aware of that process, and a full investigation would also include the trades done when Zorro "reconciled" to the new world it found after being disconnected for many days...

Before embarking on that, I was hoping @jcl or someone who knows the internals of Zorro and trd processing could add insight into why _exactly_ 1 lot closes during resume, and why the open value might have gone off (while balance is correct).