I had the same issue and figured out it was a scale/dpi ratio issue.    See bellow :   scale 1:200 / 300 dpi --> ok   TILE 200 300dpi.pdf     scale 1:200 / 1200 dpi --> ok  TILE 200 1200dpi.pdf     scale 1:500 / 300 dpi --> solid grey  TILE 500 300dpi.pdf     scale 1:500 / 1200 dpi --> ok  TILE 500 1200dpi.pdf     Mind these settings :  - Layout raster setting  - File>Prin