
If you manage to be actually online and not having your soul being eaten by WoW then you'll be the first to try.
That's only useful if you catch the error immediately. If you're save-happy like I am (though I don't manually back up... I really should) you most likely won't even notice it until you go to reopen it. By that time, all the backups were overwritten with the bad map.Zippy wrote:DoomBuilder should make regular backup copies of the map if you have it enabled. I believe it keeps three or four backups by default, going back that many saves.