Old ACAD user New ICAD user PDF placement not working

We use a lot of PDFs in our Architectural Drawings , when we are placing Manufacture Details. The PDF underlay command finds and places the page of the PDF we want, but all that you see in the ICAD drawing is this note: Missing or invalid reference
File:.\BASE GRAPHICS\PDF'S\IG_wood-window-flasshing_sill-pan_1015 (1).pdf
Sheer: 1
This same pdf placed in ACAD displayed with out any problem.

This problem was fixed by shortening the file name.

New problem is now all I get is a black box where the pdf should be.

The PDFs plot fine, but would be nice if I could see what I'm getting before I Plot