The previous update had a workaround for the PDF display bug in OS X, IIRC.
This update breaks that (at least on my machine), as PDFs, once again, either don’t display, or display almost completely blurred in the lower pane of the three pane view.
The workaround might cause rare & random freezes of Sierra’s PDFkit framework, that’s why it’s not enabled by default anymore as a blurry display isn’t as critical as a frozen app. Luckily the workaround won’t be necessary anymore on High Sierra.
The blurry PDF (often not remotely readable) means DevonThink is deeply broken for me on Sierra and since High Sierra isn’t officially out (many other apps I have still don’t function well with the Betas yet) I’m stuck.
I’m trying to get the work around to stick, but it isn’t so far.