Which CLS head do you have? Check to see that the filters are moving properly. On the 450, pop the bulb hatch off, swing the clamp out of the way and lift out the bulb. Now you can see the filters move in and out of the light path. Also check them for dust buildup, that can really mess with filter correction and exposure calculations. There is a switch for the dial indicator lights, but there is enough light spill inside the head for them to be illuminated during an exposure. Depending on the head, the dial units are not Kodak cc numbers but Durst numbers.