This is driving me nuts!
If I open Maya, and create a box for example. It has the Lambert assigned, if I assign it another shader it stays as a Lambert (but loses the connections to it, so adjustments to the Lambert's properties have no effect on the geometry's shading).
The only thing I done before this started to happen was assign 2 models from a Blinn to the default Lambert and change it's incandesence. Any ideas? It's halted my entire work flow.
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I hang my head in shame.