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3ds Max 2015 Sp2, Dell precision T7610 Win 7 (windows all update) Nvidia K6000 (driver all updates ) dell all updates
Viewport Shutdow (image atach) scenes explorer any times....
Viewport very Slow when desactivate backface culling .
Viewport freezing and stop update 😞
2015 = very viewport bug 😞
Problem solved...
Delete user autodesk folder (dfault)
change windows User profile restriction to + previlegios network (not admiistrator) .