I have just come across a problem new to me. I opened an archive drawing in LO 2020 and all pages in the file looked much like this one:
It seemed as if the problem was that LO had lost the link to the SU drawing. So I went into Document Setup and relinked it. Made no immediate difference. Then I noticed that the warning had changed to “Rendering failed. Reduce the image size or DPI.” I didn’t really understand that but found that if I changed from hybrid rendering to raster, the expected SU drawing reappeared. I could then select hybrid again and was back to where I expected.
Any clues as to what might have caused this?