Thank you, I thought the solution might just be the Gamer's solution-- save, save, save. Some MAT's overwrite and some don't. It would be really really nice if the designers let you know. Maybe, there's no way to tell. However, now I know what I want to ask for in upgrades. Ways to take things off. I love this forum, even the dumbest questions-- like this-- get instant and polite help. Thank you again.