@sebastian-roth I didn’t take that second screenshot (in the second post) until after the first one had finished. And I got it while FOG was still imaging partition 3, so you are correct, it hadn’t renamed but that was only because I wanted to get a quick image of the root:root ownership.
Partition 4 is only 1GB so it should not have hung at all.
I wasn’t around to watch the second capture finish, so I’ll have to do it again later this week.