heyas; calm down, mike. :) it switches to low altitude when you do something like.... edit one material or other, or edit the function or the filter, or change the blending percent or mode. you can see right away in the preview. you just go back to the altitude tab and change it back to high altitude. then say okay, and it'll be fine. or, you can just swap the materials, i expect. but not in all cases. i havent been paying attention to the world/object orientation part. will have to look at that, too.