I was looking through a larger document in two-page mode, and came across this. Most of the pages in the report are in portrait mode. I had this order of pages (P=portrait, L=landscape): ...-P-P-L-L-P-P-....
The two page mode was first showing the P-L correctly, but then the next was inverted, 'L-P' and it did not update the white background. I also noticed that when I scroll backwards the "opposite happens". I first come to 'P-L' which is shown correctly, but then the next 'P-L' is shown incorrectly. I attach a screenshot.
Ah, forgot to also say, the pdf in question is here: http://docdb01.esss.lu.se/cgi-bin/public/DocDB/ShowDocument?docid=215
Pages 5-16 - 5-19. Maybe there is something incorrect with the PDF itself..
The PDF is displayed by Apple's PDFKit. We have no influence over how that is dealt with, for us thos is a black box. So any bugs are outside our control and are Apple bugs, and should be fixed by them.
I reported this bug to Apple rdar://22094130