If you are able to post without signing in, then you will be able to login, as it is the same code that checks you for valid login data that is used in both circumstances. When you try to insert your username and password, on the login form at the top of each forum page, please make sure that that password field is totally empty before you start inserting your password. Delete all the characters that you find and then, and only then, insert your own password. That should solve your problem.
Thanks for that but it doesn't work! You would think that if my password was incorrect that I wouldn't be able to post on A/L but I can. I can't even notify them or check my password as it is not recognising my e-mail address. How strange!!!