Symptoms:
After opening a file, a mesh isn't there.
Individual faces on a mesh show in wireframe but not shaded.
Certain materials are invisible.
Some edges refuse to be smooth shaded despite correct vertex and face normals.
Fix:
Find the mesh in the outliner, assign an arbitrary material, then undo.
If after undoing, material assigning becomes glitchy, save and reopen the file.
Watch video Disappearing Mesh Glitch and Fix (Maya 2012) online without registration, duration hours minute second in high quality. This video was added by user LegendOfLinq 07 November 2012, don't forget to share it with your friends and acquaintances, it has been viewed on our site 21,103 once and liked it 95 people.