The DWF test is intended to isolate if the problem has to do with the plotter drivers you're using. I realize it's probably not what you want to use for output.
At this point we have to narrow down the cause of the problem. The program doesn't just spontaneously start triggering Fatal Errors when plotting, usually there is an outside factor that needs to be isolated. Something obviously has changed between before, where it was working, and now, where it does not.
Kyle B
Kyle Bernhardt
Director
Building Design Strategy
Autodesk, Inc.