Herby/Huck, you broke map transitions: (starting from individual maps works)
CModelLoader::Map_IsValid: No such map 'maps/l4d_149_2.bsp'
changelevel failed: l4d_149_2 not found
CModelLoader::Map_IsValid: No such map 'maps/l4d_149_3.bsp'
changelevel failed: l4d_149_3 not found
Also, I see what you were going for by increasing the rate of horde spawns as you get close to the safe room and having double Charger Spawns after the halfway point of each map... but couldn't you have done that with v13.0?