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.