PDFs rendering as black rectangle in Preview
Almost all my PDF documents are rendering as black rectangles in the Preview.app. The file is shown correctly for a glimpse and then a blackened. Opening the exact same file in Firefox or Adobe Reader displays it properly.
This problem occurred with many users before. For some, the solution was to recalibrate the display colors. This does not help in my case.
Please notice the thumbnails in the screenshot and the fact that the black rectangle is not shown in the first few lines of the first page of the document.
I am running macOS High Sierra 10.13.6 on an 27 inch iMac 10,1 (late 2009), Intel Core 2 Duo with 3,06 GHz and 8 GB RAM.
Does someone have any idea how to solve this? I am a university student and working a lot with the Preview app, this is really influencing my everyday workflows.