Hmmm! I tried the other stuff last night, delete shadow.tmp files, switch back and forth between P4 renderer and p5, all to no avail. I am so glad you found this! I don't know how you did it. After you've renamed the light in the .lt2 file then you just use the light sets from the shelf without having to rename, right? That's not so bad. I assume you can edit the .lt2 file in wordpad? Thanks very much!