Sometimes the entities can have no angle property set at all, means that if you create in editior, for example, "info_player_deathmatch" entity and won't change its angle, the editor won't save the angle property in bsp, thus the zangle will be NaN and we wont see the world.
Sometimes the entities can have no angle property set at all, means that if you create in editior, for example, "info_player_deathmatch" entity and won't change its angle, the editor won't save the angle property in bsp, thus the zangle will be NaN and we wont see the world.