PDF Display

I’m wondering why a PDF file is not showing correctly in DT. I remember this series of files looking right in the past and they still look OK opened externally. The top view is what I see in DT, the bottom is in Acrobat.

DEVONthink is using Leopard’s PDFKit (and Quartz in the end) to render PDF documents, therefore it might be a bug of Mac OS X. How do the PDF documents look like in Preview?