Fringes of Algo will be offline for a time later today during a software upgrade. The current schedule is for the downtime to begin at approximately 7 pm Eastern Time (1 hour, 15 minutes from the time of this post).
I can't say for certain how long the site will be down, but this is expected to be a very brief downtime. The upgrade process shouldn't take very long, if all goes smoothly. I apologize for any inconvenience.