this seems to happen to me in 3ds max 2012 alot more.
things Ive noticed that help:
Turn off nitrous and use good old directx9
reset xforms on your object
apply a edit normals modifier and manually merge/break the normals
hm I went to edit normals ad broke all the little hair things on them and it fixed it I think. So Im guessing ill have to redo the norms and uvs on them later.
Just apply two Normal Modifiers. The first one will flit it, and unify them all, the second one will make your model good as new. It happens to me on a regular basis.
Replies
things Ive noticed that help:
Turn off nitrous and use good old directx9
reset xforms on your object
apply a edit normals modifier and manually merge/break the normals
define "fix the ensuing mess properly"