[Forseti]

No, only using the one machine. The link that bsmith provided includes as an example *more than one browsing session* - I wonder exactly what is meant by that? Surely if I tick the *remember me box*, close down my browser to do other work and then restart my browser to check emails and this site an hour or so later then the cookie should do just that - remember me.

The reality is that it doesn't of course, and just prior to posting this message I opened up my browser (IE8), clicked on PR in my favourites bar and although NOT signed in I received the same security advisory.

You'll also note that from the screen grab link that I provided in my initial post that I was still actually signed in to the site so this problem appears to be related to not logging out prior to closing down the browser and then returning at some later time. Strange because I do this on numerous sites as I'm sure others do and never received this security advisory (or anything similar to it) before.