I just had a similar experience. I was just finished marking up a PDF with a new s/w tool and decided to save an image that was in the PDF for use in the future. For some reason this particular PDF prevented me from opening the image in a separate tab. I thought it might be the new editing tool, so I reloaded the PDF to get a clean copy.......
In Prague on the Charles Bridge there is a plaque and on this plaque is a man with a dog. The dog is polished and shiny because everyone who sees it, for centuries, rubs the dog....because he's a really good boy!