Hi Dave, Sorry to be unclear.
I copied a .tcw file with copy/paste function in Windows 7.
This ORIGINAL file had the pdf underlay in it - working OK.
I may have moved the pdf later, I will re check that again this afternoon to be sure that
all is in the original place so it can find it. ( I'm going to be out most of the day. )
Before I copied/pasted the file I had turned off the underlay layer - couldn't see it and so did not know
it had not also copied - or was not there for whatever reason. Worked on it some more then went to print to pdf and it crashed without any warning why.
I looked through the drawing and finally did find that the underlay was still in selection info and there is an outline in model space where the pdf was but no pdf - just the outline - a rectangular shape that shows in Selection info as underlay. I see in Selection Info/Misc that there is also the original path - I'll be sure to check it that way this time.
This may easily solve why I don't see it, but as you say, maybe not the crash itself.
I think I was just surprised that it crashed TCAD without warning instead of just printing without the image, the pdf, showing up.
I feared that it was something more serious in the file than just possibly some re-arrangement of folders containing the referenced pdf - I will still check that out.
Hope this makes some sense.
I got your copy and will work on it later this afternoon when I can pay attention.
Oh yes, it is TCAD V18 Pro Platinum 18.2 - build 73.1
Many thanks for your help.