Thick lines and xtrudeable shadeing

I am using the rectangle tool. I get thick lines and shading along the edges that extrudes. I don’t want either of these things. What am I doing wrong?

Albert Drybrae

Do you have “From edges” ticked on your Shadows tray?
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To me it also looks as if the rectangle is not laying flat on the ground. Or is your model a long way from the SketchUp model origin?

You have profiles turned on for the edge style. You can turn off Profiles from the view menu.