Thank you, Simon!
Having collected my message this morning, (having logged myself out and then in again because I clicked in the wrong place, see another thread) I opened and read it, and then realised I no longer had to refresh the page! Actually, now that I think about it, I think that's been so for several recent messages. I don't know when I last had to refresh the page before I could read my message, but this morning it is fixed!
Thanks!