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Brooks Duncan of the DocumentSnap site published a note from one of his readers that warns that the OCR text layer added to scanned PDFs by Fujitsu’s ScanSnap software will be deleted if you edit the PDF in Preview.
More concerning, and this is what finally pushed me to track down all these reports and write this article, is that the recently released macOS 10.12.2 has introduced a serious new bug related to PDFKit. It’s sad that basic functionality remains broken for so long - especially given that PDF was an area where Apple used to excel. None have been fixed, as far as I can tell, and I’ve already filed two Radars for new issues in 10.12.2. I ran into a lot of PDF bugs in macOS 10.12.0. In fact, Michael Tsai, developer of EagleFiler, just published a blog post confirming his problems with PDFKit: It’s not only DEVONthink - a lot of other applications (such as EndNote, Skim, Bookends, and EagleFiler) are also affected. And there’s still work left to be done.ġ0.12.2 introduces new issues (it seems that Apple wants to fix at least the broken compatibility now) and of course fixed almost none of the other issues. And to make things worse, lots of former features are now broken or not implemented at all, meaning that we had to add lots of workarounds or implement stuff on our own. However, it was released way too early, and for the first time (at least in my experience) Apple deprecated several features without caring about compatibility. Christian Grunenberg, DEVONthink’s lead developer, characterized the rewritten version of PDFKit in Sierra as “a work in progress,” saying:Īpple wants to use a common foundation for both iOS and macOS. Eric Bönisch-Volkmann, head of DEVONtechnologies, told me that they’ve spent a significant amount of development time working around Sierra’s PDF-related bugs in DEVONthink. However, throughout the next few months, additional complaints kept surfacing. Since Craig Landrum’s comment came after the release of 10.12.1 and the fixes for ScanSnap, I filed his criticism of PDFKit away as something that likely had been true but was no longer.
There have been numerous bug reports sent to Apple on the several serious issues found with PDFKit and we hope Apple addresses them in an upcoming point release.
Software that uses third-party PDF libraries probably runs fine, but those of us in the development community who relied upon Apple’s PDFKit library were really slammed - and we have no way to fix the problems ourselves. The primary problem with Sierra with respect to PDFs is that Apple chose to rewrite the PDFKit framework in macOS 10.12 and it broke a number of things that PDF-related developers relied upon (I write scan-to-PDF software and know other developers who were impacted). Developer Craig Landrum, who founded the document management system company Mindwrap, said: The first I heard that Sierra’s PDF-related problems might affect more than ScanSnap scanners came in a comment left on one of those articles on 26 October 2016.
Now, however, it seems Sierra’s PDF-related problems go deeper, and you should exercise caution when editing PDFs with Preview. Those problems turned out to be less severe than initially feared (see “ ScanSnap Conflicts with Sierra Easily Avoided,” 3 October 2016), and Apple resolved them in macOS 10.12.1 (see “ macOS 10.12.1 Sierra, watchOS 3.1, and tvOS 10.0.1 Mostly Fix Bugs,” 24 October 2016). One of the first problems with macOS 10.12 Sierra revolved around PDFs created by Fujitsu’s ScanSnap scanners (see “ ScanSnap Users Should Delay Sierra Upgrades,” 20 September 2016).
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