Printtopdf in a database which has been working reliably for years produced what Preview on several different Macs alleged were unopenable pdfs for a couple of weeks, and fortunately are now opening as expected again. (The pdfs which Preview did not open still do not.)
All of our many other
Printtopdf pdfs from different Panorama files were opened by Preview through this period. I have never seen this problem before, and nobody in the forum appears to have reported this issue. I do not think this curiosity was caused by Panorama, but wonder if any forum readers have advice.