Every now and again I get the below pop up when printing, when this appears part of the print does not come out either a spreadsheet or certain blocks. It has been happening quite a lot since Auto cad 2012 was installed on my computer.

 
'attempting to cancel sheet'
 
 
 
The printer is an Xerox 6204 Wide Format.

it could be size of your files.
I am having the same problem when I try plot drawings with jpeg's or pdf's attached or when dwg has lot of 3D objects.
 
we use other machine for this kind of files, which is top spec one
hope this help