zone colors won't show please help

[rick hoag]

for some reason i cannot get zone colors to show obviously it is some parameter i cannot find

[vistasp]

Have you checked your pen sets?

[rick hoag]

Thanks pen sets were ok
turned out that the colors were being hidden by the slab I was able to fix it by bringing the zone forward
as I suspected a simple fix that eluded me for several frustrating hours