Background Image From PDF

 From:  propmaster (PWWHDR70)
5305.1 
I'm trying to make a background image in MOI from a PDF. No matter what format I convert to (JPG, TIF, PNG) MOI doesn't show the image.

It is a multiple page PDF, but I always select the page I want and convert only that page.

Could there be some copy protection in the PDF that I'm overlooking? Or is there a limit to the file size in MOI for background images (it is rather large - 40,000+ pixel width)? It's not a vector image, but I don't think that's the issue.

Admittedly, I don't know as much about PDF files as I probably should. This one's probably a no-brainer. :P