I've got a handful of drawings that just simply refuse to plot the DWF underlay background. On a full-size sheet (30"x42") the DWFs show and plot correctly. However, in the same drawing on a different layout tab (11"x17") the DWFs don't plot but they show up in the preview. I've verified that the layer they are on is not set to NO PLOT, it's turned on in the viewport, I've got PLOT PAPERSPACE LAST turned on in the plot dialog box. I've went as far as to create a new drawing, bring in all of the xrefs, create NEW layout tabs and viewports and still the 11"x17" layout tabs don't plot the DWF background but it plots on the full-size sheets. Any suggestions or sysvars I could change?