SOLVED BY SHIRLEY!! This totally weird. I was adding another source to Harry (see his profile) and I can no longer scroll down to add the source after the ones that I have already added. When you look at the public profile you'll see that there are 3 sources. When I go into edit to add another source those 3 sources aren't available.
Has anyone any suggestions? I shut down FireFox and restarted it in case there was something odd going on there. I've tried extending the edit area and nothing, the sources I've added just aren't showing up.
I've got to be doing something wrong or else it's my system. It was OK yesterday.