Loading Content to Print
Updated iMac to Sonoma 14.5, could not print an email. Kept getting message "Loading Content to Print". Tried creating a .pdf, got message "Loading content for .pdf". I went to mail settings > privacy and unchecked the box "Protect Mail Activity", leaving only the box for "hide IP address". I then force quit mail and restarted. This seems to have corrected the problem.
iMac 27″, macOS 10.13