There's a weird bit of behaviour going on, if I close my browser. On any device, it shows me as signed out.

Thing is, I don't think I am actually signed out.

If I click the cookie message, click to read more and click back to home. I become signed in without signing in. It's really strange, but several of my sites members have mentioned that they are being logged out.

It's just IP.Pages this bug affects, you browse to any other location you are still logged in. You go back to any IP.Pages section and you are signed in.