There is a site security update we're about to roll out that will increase the strength of our session IDs.
This update will be run in the next day or two and we will announce a new site version once it is complete.
The update makes it much harder for attackers to simply guess valid session IDs, as we move from 4-bit MD5 (eg: 9e107d9d372bb6826bd81d3542a419d6) to 6-bit SHA-512 (eg: UX8ScxaAoJI2i9WvhUSrHw6vVzJFkCZ3-4vsbiRmA,kylJ4C0DY5qT0T5sGmPX2Ixyiimn0Yn-,QKxVqIzE4T2).
These crazy looking IDs are something you don't normally see but they are stored in cookies that your browser receives and sends after you log in, as a way of identifying your valid login session.
The side effect of this change is that all currently logged in sessions will be reset, so you will need to log in again after we run the update.
As long as you know your password (or your browser knows it) then you just need to log in as per normal after the update and there should be no issues.
Please make sure your email address is valid and up to date as recorded in your Account Settings. This way, if you have any login issues, you can simply reset your password via the Forgot Password option on the Login Screen. This requires a valid email address connected to your account to work.
As the maximum session age is 1 month, all users have to log in at most every 4 weeks anyway, but we figured it's still best to give you all a heads-up!
If anyone has issues after the security update and can't log in, please email us at email@example.com