Here are my failed renders from your donut tutorial:
This is the one that turned out like a powdered donut....
And here's the one the turned out kind of okay. But the problem is that the material somehow is sideways instead of right-side-up. Maybe I'll try the tutorial again and pay more attention.
You need to change the texture coordinates; in the Textures Panel, under the mapping tab, set the coordinates (under the Projection:Flat thing) to Z, Z, and Z. You won't be able to see any difference, but it will still work.
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