I've opened it and set it to AUTO, but that doesn't fix the problem.
Where it is is 4 x 1 size or it would have been a problem before the update.
I DEPLOY with it set to AUTO, same problem.
I Force the DEPLOY and then go back and set it back to 4 x 1.
Same problem.
All good. I just don't understand why this happens.
I'm not smart enough to know the details and so can't/won't criticize NR for doing it as I am sure it is not intentional. It is just a quirk that catches people like me.
I meant one-off in the sense that it was a particular update that triggered it. Once you have got past it you should not see it again on that system. It is probably a good idea to delete any unused config nodes before upgrading.