The case of the disappearing TFS task board

So after wondering where all our tasks had disappeared to, it turns out that someone had changed the default Area path, and ticked it in the _admin/_areas section of the portal.

This has the knock on affect of removing any items from the task board that are not under ticked area paths, hence the stuff that was in our task board disappeared, even though the items were all still there in TFS and accessible via team explorer.