Transparent/gray checkerboard background in PDFs after macOS Tahoe update

SimonCK wrote:

https://discussions.apple.com/content/attachment/d14fbd40-94eb-41b3-bc77-81b4db561e11

[Edited by Moderator]

Original Title: After updated to macOC Tahoe, the PREVIEW is now showing many PDFs with transparent/gray checkerboard background, even a PDF that I created from Excel on the same macOS. Another PDF is now cannot open as unable to verify it is free of malware

Try a different PDFeditor if the general app Preview.app is not interpreting it correctly.

there are many, here are a few examples:

Acrobat Reader / Adobe Acrobat DC

https://get.adobe.com/reader/

PDFpen / Nitro

https://pdfpen.com/pdfpen/

pdfExpert

https://pdfexpert.com/

Master PDF Editor

https://code-industry.net/get-masterpdfeditor/

PDFgear

https://www.pdfgear.com

Both succeeded in opening the Federal Government files and able to retrieve all data, continue updating, save, close and reopen again.

Foxit Reader / Editor

https://www.foxit.com/

Wondershare PDFelement

https://pdf.wondershare.com/

SimonCK wrote:

I just exported one of my Excel files to PDF format on my Mac, and it is still showing a checkerboard via Preview.

I don't have Microsoft 365/Office/Excel installed to test. Are only PDF's created with Excel exhibiting the problem?

For what it's worth, I checked 100+ PDF's going back to 2008 and none were transparent. Not in Quick Look, Preview or the Preview panel in the Finder.