- If you add an effect to a skin, and this effect requires a material, you need to assign that material to the entity. Otherwise, your effect won't work of course because the material is missing.

- If you assign a material to the entity, that material must NOT contain an effect - otherwise the effect would be assigned to the whole entity, and not only to the desired skin!

I hope this makes sense?

So, use MED to add your effect to a skin - a skin with texture of course - and use WED or the script to assign the required material WITHOUT EFFECT to the entity. If you've done that, and still have problems, please post again.