Corruption in pdf to tif conversion

[rexmism]

I've been using ImageMagick to convert pdfs created by Access to tifs. This has been working fine for several months, but the other day, a different user created a pdf file of many pages, and when converted, they are all corrupt:

The command I'm running to convert them is:
C:\Program Files\ImageMagick-6.8.9-Q16\convert" -density 150 -quality 100 -sharpen 0x1.0 -resample 300x300 -compress group4 -type bilevel -monochrome "%%~nxI" "%%~nI@%%02d.tif"

Any thoughts on what might be causing this?

[snibgo]

Any thoughts on what might be causing this?

As you haven't linked to the PDF, we can only guess. Perhaps the PDF uses a font that isn't embedded in the file or available on the computer.

[rexmism]

Unfortunately I can't provide the PDF because it's sensitive information. Thanks for the idea, but I don't know why that would be the case when the files generated by Access have been working fine previously.

[fmw42]

Has your version of Ghostscript changed? What is the version? I have heard problems with GS 9.26. If so, back off to 9.23 or 9.24

[rexmism]

The Ghostscript version hasn't changed for me. I did get a piece of compelling evidence, though. To create the PDFs, they use print to PDF, and I found that the user creating the trouble file is using a different printer - Microsoft Print to PDF, instead of the usual Adobe PDF printer. Is it possible this could be the problem? It's the only difference I can find.

[fmw42]

I do not understand how a printer can create a PDF? Please clarify?