I am using Revit MEP 2012 and when doing a batch plot to a Xerox 6279 A0 plotter 50% off the batch come out perfect, the other half come out inverted for example, the entire page comes out black and all text, border etc comes out white.
If i then subsequently print the 50% that plotted incorrect again, 50% of them will come out perfect and the other 50% will be black again, this works all the way down to 2 plots then its 50/50
this isnt job specific as i have tried this on many different projects.

Has anyone ever seen this and have any idea how to rectify.