Duration: 2:26

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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.