Thank you for your reply. I am sorry for not providing enough information.
I also failed to mention that this bug occurs spontaneously. Everytime it occurs, I try to replace these grey rectangles with the images they used to be. However, this only works for so long. Because when I come back to the file, the images are all corrupted again. It’s very frustating.
Actually, the bug just happend to me right now. Luckily, I could succsesfully replace the grey rectangles with the real images again. But as soon as I closed the program and opened it again, the images went bad.
They are still shown as iamges with their correct filename in the layers bar though.
At the moment I cant recreate this bug and everything works fine. But I willl post a images as soon as it happens again to me. Sorry for the inconvenience.
The version just sasy 2019-2 as seen in the attached image.
Thank you for your efforts.