You're right, I updated again and used the classic UI and it works fine. What on earth are they thinking, using a UI which can't do network functions.What happens when you try to edit one? A couple of days ago I updated to 6.0.20 then yesterday to 6.0.22 and don't have any problems updating existing networks.
Edit - Seems there's problems using the 'new' settings. I don't use them so didn't notice a problem.
