Broken Display Modes

hi everybody
i recently got a big problem with rhinos way to show objects
in all display modes the objects overlaps with each other … like they are transperent
for example when i switch into the shaded mode i can see all edges of the objects even thoes on the backside
of the objects
and in the rendered mode there also overlap so wrong that it locks transperent
but everytime i select an object it arranges new and pops in front of the other objects although it lays behind off all other objects

i tried to restore all display options under properties
i reinstalled rhino
i restarted my pc more then once
i deleted all mcneel datas … in the regedit and appdata…

but nothing worked
i hope you guys can help me

Do you have an AMD card? If so you might check out these linked threads and see if you are having the same problem… --Mitch