i have a model in zbrush. i have areas masked off using polygroupd. whenever i subdivide the mesh...i can't walk up and down between subdivisions. i did a test with a basic cylinder imported from max and i can do it with that. however when i load my tool w/polygroups masked off...i can't go through the subdivisions on the area i want to sculpt. i can subdivide it...but can't shft+D and D.
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Hope that helps.
EDIT: read your post again, looks like you know this already. Strange problem, hasn't happened to me before, maybe someone else can help.