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My HP Photosmart prints on plain paper just fine, but sometimes when I put in paper that measures identical to plain 8.5" x 11" paper, it refuses to print and gives me an error message that says my paper is too small.  I am trying to print on special "certificate" paper.  When I cancel the print job (as instructed on the error message), the printer easily moves the paper through its roller guides so I know it isn't jamming or anything.  I have no idea how to resolve this.  Please help!

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