It is incredible that we are still finding ways completely break this engine. Last week, when working on my ill-fated microcontest entry, I encountered this strange error when attempting to load the map: Host_EndGame: Map coordinate extents are too large!! Check for errors! Checking Alt+P and the compile log for errors returned nothing, and the map itself was cordoned to a reasonable area. However, I was eventually able to trace the problem to an instance which had a cordon box of its own. Once I disabled this, the map loaded successfully. Hopefully this helps someone who repeats this error in another twelve years.