OK so I was making a new map (new to Hammer SDK), everything was going perfect, added the lights (light and light_spot is what I used), tested the map a couple of time, when suddenly, after a while when I loaded the map there was no dynamic lighting at all. It looked exactly like Hammer's 3D Shaded Textured Polygons in the 3D view. What did I do wrong? or pressed that shouldn't do? I must mention that I had a little issue with hammer, one time it crashed and the Error 116 ( https://developer.valvesoftware.com/wiki/Cache_Needs_Repair_error )window popped up (but i got it work again). btw, if there is already a thread about this, I'm sincerely sorry, I did search but couldn't find something useful.