MAybe try lowering all your lighting to black, including ambient and sun. Place an object, assign perpixel lighting action, place an omni light right in the same location, turn it to white. Build and run your level, making sure your player is using the perpixel shader... thats how I always start my perpixel levels, since this technique is wonky... If you see lighting show up att all, go from there.. sorry I cant be more helpful, I actually havent touched this for weeks, been playing with the doom3 engine