ZBrushCentral

messed up geometry

ive created a head and textured it in zbrush, I saved it and came back to it the next day and my geometry was all messed up. If any one can explain how this has happened id be very grateful. There is an image showing the problem. This problem only happens on higher subdivisions. on subdiv 1 its fine.

Attachments

messed up geometry.jpg

please any help would be great even a suggestion