Hi Pwr, There are two domain names to the forum.
www.engravingforum.com and
www.handengravingforum.com It could be you are logged into one but the email links I send are the other and that is why it is asking you to sign in again. Try signing into both and having cookies accepted for both. Once you're signed in and have a cookie set for both it shouldn't ask you to sign again in either one.