An question with some unknown variables ... but here goes ...

We have recently discovered portions of certain images lose elements when PDFd and processed through our printing client's laser printing setup. They are running Canon systems and drivers.

What falls off are lines and arrows from certain portions of only SOME of the figures/images in a PDF document.

I had a suspicion that XML in the original images may be causing the strife...as XML on images processed via Photoshop CS is attached by default, and these pictures get rejected when I post them to some web forums. That made me think that perhaps XML on images may play havoc with certain printers/drivers?

Clearly I'm not up on everything that's involved with how XML behaves across the board.

Mysteries involved with this scenario:

1) Images were submitted to us and we don't know if they were processed via Photoshop or some such program which might add XML tags;

2) We're only guessing at how these images were originally made, but we suspect they were CADS which were then exported to .eps or .tif for the PDFing process;

Printing the PDF document in our office on several different Xerox laser printers (both colour and black and white) results in perfect printouts - nothing goes missing.

The only time elements go missing from the images is when the Canon gear at our printer runs the doc.

Suggestions?

Thanks!