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Preview Export as PDF Documents are Blank
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I am not seeing the problem in your post.
What are you trying to "Export as PDF"? What are you using to open the newly created pdfs?
I have 10.12.2 installed and "Export as PDF" in Preview works fine for me (no blank pdfs). I tried opening a .jpg in Preview and used Preview to "Export as PDF" and it worked. I tried opening a .doc in Preview and used Preview to "Export as PDF" and it worked. I also used Preview to reopen the new pdfs and they looked fine.
What are you trying to "Export as PDF"? What are you using to open the newly created pdfs?
I have 10.12.2 installed and "Export as PDF" in Preview works fine for me (no blank pdfs). I tried opening a .jpg in Preview and used Preview to "Export as PDF" and it worked. I tried opening a .doc in Preview and used Preview to "Export as PDF" and it worked. I also used Preview to reopen the new pdfs and they looked fine.
This was posted on the blog section of Macrumors:
https://www.macrumors.com/2017/01/03/macos-sierra-users-avoid-broken-preview-edit-pdfs/
https://www.macrumors.com/2017/01/03/macos-sierra-users-avoid-broken-preview-edit-pdfs/
I've had no problems printing docs or pictures to pdfs under Sierra 10.12.2, but I don't really edit the docs nor interact with other frameworks.
I have experienced problems with scanned PDF files after they have been edited with Preview. The post-Preview-edited files are corrupted in that the OCR layer is gone, and in some cases certain pages of the PDF documents are blank or gone.
Not all PDF files are corrupted in this manner. In my case, only the OCR'd files created with my Fujitsu ScanSnap scanner were corrupted by Preview under macOS Sierra 10.12.2. Other PDF files downloaded from other sources (bills, bank statements, etc.) and subsequently edited with Preview were not affected. Other users, however, have reported significant problems with files that have nothing to do with Fujitsu ScanSnap scanners. See the full discussion thread in the link posted above (post#4).
This apparent Preview-related file corruption only happens in the macOS Sierra version of Preview. This does not happen under OS X 10.11 El Capitan. This is a serious problem - many people rely on these PDF files for business (real estate, legal, etc.) and for storage of important personal files.
The MacRumors blog post (link above, post #4) refers to a rewrite of PDFKit framework for macOS 10.12. This may be at the root of the problem.
Not all PDF files are corrupted in this manner. In my case, only the OCR'd files created with my Fujitsu ScanSnap scanner were corrupted by Preview under macOS Sierra 10.12.2. Other PDF files downloaded from other sources (bills, bank statements, etc.) and subsequently edited with Preview were not affected. Other users, however, have reported significant problems with files that have nothing to do with Fujitsu ScanSnap scanners. See the full discussion thread in the link posted above (post#4).
This apparent Preview-related file corruption only happens in the macOS Sierra version of Preview. This does not happen under OS X 10.11 El Capitan. This is a serious problem - many people rely on these PDF files for business (real estate, legal, etc.) and for storage of important personal files.
The MacRumors blog post (link above, post #4) refers to a rewrite of PDFKit framework for macOS 10.12. This may be at the root of the problem.