Huh? I don't see how that fixed the problem. If you stick a checker texture on Lambert1, assigning a new material to an object doesn't fix lambert1. All you're doing is sticking another material onto your object. ?????? Am I totally missing something here?

If you create a new sphere, you should be able to see that you fixed nothing because it will have lambert1 assigned to it.

I believe what you need to do is open Hypershade, right-click lambert1, choose graph, select the texture nodes (including the 2 or 3D placement node), and delete them.