I have a user, only one I know of, who has to sign on every time he goes to another message.  So he goes from message A and tries to view message B, IO makes him sign on again.  It is like the "Messages" tab on the left is signing him off?

Anyone else seen this, and if so what is the fix?

Thanks,
Tom

The most likely thing that springs to mind is that your user is blocking cookies from Groups.io.

When you log on, Groups.io sets a small first-party cookie with an authorisation token. Every interaction with the messages uses this token, so if it's not present the login process is triggered. Cookies are not automatically bad things, indiscriminate blocking of everything will also break good-faith players like Groups.io