Just to add a little more to the blank pdf problem — I was investigating one of these today. I think what may be happening relates to the image formats being used. I believe the eDGe only reads jpeg and png??? I tried to find a way to find out what type of image files were in the pdf I was looking at, but wasn't able to do it. I did find out that there was some type of compression on it that resulted in it not copying to indesign (message said I needed qt to view it because of compression?). So what I did was export a couple of images out of the pdf to jpeg, and rebuilt a page. That page viewed correctly on the eDGe.

I believe most of the automatic ocr setups use tiff because it's not lossy; or they give you a selection, but the default is set to tiff. So, I'm kind of thinking that's the problem. And, in addition, there's whatever compression type has been used. The pdf I was dealing with was output from ghostscript.

Hope it sheds a bit more light.