No Spectator Cameras
It's fairly obvious when there are no spectator camers as, after loading the map, players will be viewing the map from the default 0 0 0 coordinate, which may create an odd viewing angle. Before putting your map on a public server, make sure it has at least one spectator camera (info_observer_point) entity in it. Not having any cameras in the map may crash a dedicated server running it when all the players on a team die, leaving no teammates to spectate. This happens because the server is trying to force the dead player to spectate something that doesn't exist. When you do add an "info_observer_point", make sure to aim it at a common battle area inside the map and not at a wall or inside a spawnroom.
