[sorry, answered in the wrong thread after being harrassed by Apple when logging in] Not an answer, just a confirmation that we have Kyocera and Dell color laser printers that bark our PostScript errors on the page of completely different PDF documents (generated in completely different ways), printed from Preview ONLY WHEN printing from Big Sur. The same documents give no errors when printing from Catalina. I'd say, likely some low-level PostScript-problems introduced in Big Sur. This goes beyond the drivers (Kyocera and Dell, both having the same bugs?). The most readable of the errors that get barfed onto the page is "OFFENDING COMMAND: xshow". This can hardly be a coincidence.