If I change the password on the login screen, it does throw an error - so obviously the userid and password (which are taken from a keyring) are correct but for some reason the site isn't logging me in. This can only have started in the last week or so - since my last post on the Database Accuracy?... thread - as I posted perfectly ok then.
It doesn't appear to be the browser or keyring either - as I've created this secondary account and logged in perfectly ok via the website.
Best answer by steveTu
Tried yesterday afternnon and again this morning and the original account is working fine now. (used to post this reply) - so it would appear to have been a temporary issue (I had shut down my laptop and restarted it - so complete refresh - before posting the original issue).
(FYI - My log in credentials are saved in an OS keyring not in the browser itself per se.)