I have a drawing which is comprised of 1st & 2nd floor plans and elevations. When plotted to an HP 450c the elevations and the 1st floor plan plot but not the 2nd floor plan. When the drawing is sent to an 11x17 printer as scale to fit all elements are printed. I have checked the no print layers, ensured that the 2nd floor isn't on defpoints and it's not an xref. Any ideas as to the possible problem?