Hi Orch, thanks for staying on this topic--you have succeeded in verifying for me what it is that I was doing (wrong) every once in a while, (like yesterday!) namely, losing track of the active section plane, especially in models containing a lot of them. And Gai-good tip to check their status before updating, mystery solved.
...And btw, I'm probably the last person standing to have finally found the "Hide in other scenes" plugin. (if there's a better one, I'd love to hear about it...)
