I have the same problem. The text is masked on the screen but not on the plot from our HP1055CM. (See attached screen captures.) Another strange thing is that the masking works when plotted to our HP5550 Laser Printer. Yes, changing the Merge Control to "lines overwrite" in the Plotter Configuration Editor solves the problem, but it creates a new problem. Since we use a lot of solid hatching, we have to make sure it is all "moved to back". But with the lines overwrite setting, we don't get the "look" we want when lines pass through the hatching. Perhaps i'm just being too picky.....
I'm wondering if it could be a driver issue. Attached is a screen capture of the driver we're using.
Advice anybody?