Dear Alan,
Thankyou so much for your extraordinarily detailed response.
I am a board admin on another website, and fairly well versed in stuff like the cache clearing malarkey, and I did wonder if it was to do with the fact that I have just upgraded all my computer innards and given my hard drive a good hose down, so I *should* have only got a cookie for here when I came back after the upgrade.
I didnt know about the proxy-switching, and am on Wanadoo, so thats another possibility, I guess.
I didnt need to log in just now when I visited via the email link, so just to be on the safe side I will cut this to paste and then submit and hope it has indeed resolved itself by magic
Edit - it seems fine. Perhaps its to do with the home page log in. I'll try visiting via the front page next and see what happens.
Edit 2. Its DEFINITELY when you try and log in via the home page. If I come in via the forum main page it knows who I am.
Huzzah, at least thats easy to deal with.
Thanks anyway!