Draco, this was very helpfull and I was able to replicate your findings. Its the specific folders that are making the difference here, previous notes seemed to indicate to place the system named .png files into the images folder.. Lurker's comments have also been helpfull, in confirming the second part of your reply. I was hoping I didn't have to create different system configs to enable a different underlay for say a nightmods category or say a physmod category. It seems however thats how it works. Thanks guys for your friendly replies. cheers