My menus have been stable for a while, and work fine. But I thought I'd slightly change the wording to a couple, and went to the area where one does this (Appearance - Menus).
All the lists on the left are greyed out, and the menu I had created is no longer on the right. However, the menus on the site are there and work fine, provided I don't want to change anything.
I have edited the native css with minor colour changes, but I have not done the latest Frontier update. Site: http://www.bapt.org.uk/
What has happened? How can I fix it?