Thanks for getting back to me.
I'm using RM7, and following the instructions in "Getting the best ... ", as I have done from the start. As I think I already mentioned, I haven't had a problem until this weekend, so I was completely flummoxed by what was happening.
However, I don't know if this is now going to turn into an egg-on-face moment for me, but I just tried clearing the caches in Safari manually, and this seems to have worked. I just hope it isn't a false dawn.
Sorry to have been such a pest, but I had given the URL and login instructions to my cousin, and was getting anxious that she wouldn't be able to access it.
Thanks again or your help.