What I was exploring during the troubleshooting process with this isse is a somewhat common known issue where for some plotters - for some reason or another - it's been discovered that the Acad plot window had to be set to Landscape but within the plotter configuration it had to be set to Portrait to plot correctly. That's when I was able to plot successfully but at the time I was not able to confirm that plot used the settings I had intended...when the client has some time, we'll connect up once more and I'll test that possible idea once more.