What is a .tdl file? Is that a temporary 3Delight texture file? Yes, one of the D|S "helper" programs is called tdlmake as soon as you load an object that has textures, or apply textures with a script preset, tdlmake begins converting all the new textures into .tdl format. They're stored in the StudioTemp folder. A few seconds after you quit D|S, these temp files are automagically deleted. This used to be different back in the Beta days, originally the .tdl conversion didn't happen until you hit the "Render" button, which slowed down renders. This way you can still play around with posing stuff as soon as it's loaded, although there is a slight speed/performance hit, while the conversion is going on in the background. Except sometimes it doesn't quite work right, which seems to be the glitch that's tripping you up.