I was creating a new map recently, ihad the foirst room, a ladder, a desk, a chair, and a dead scientist. I had the ladder( i'm not the spelling champion of the world) close to a airshaft and i had a board woth little cilenders for nails holding it down. I changed all the vents to walls before i carved and saved. It was at this point i decided to test my map.
Then all hell broke lose.
The color was off for reasons beyond me and my light was not working properly. This was a mystery untill I looked up and discoverd that a huge chunk of the ceiling just dissapeared. I checked the map on Hammer and it was fine. All the textures were good and there were no errors except for entities with unused values. Anyone have an idea?