problems plotting AutoCAD2002 dwgs in AutoCAD2004

I have a client that does drawings in AutoCAD 2002. I use AutoCAD 2004.
When he sends me his drawings, I open them up in my 2004 version and plot
them using his CTB file. The problem that I am having is when I plot his
drawings, his lineweights are really light, you can barely see them on the
sheet. When I go into my version of 2002 and plot them, they turn out fine.
And when I go into 2004, start a new drawing, setup the limits and ltscale,
insert his drawing into it, then finally print it, it turns out fine again.

Has anybody run into this before and can they let me know what is going on?

Thanks in advance
Roger

 

I have sent the file to the "Autodesk.autocad.customer-files" newsgroup.
Roger