FC29, Cinnamon desktop, fully updated. The printer is an Epson ET-4500, connected through WiFi. The Administration->Print Settings dialog detects the printer. Printing a test page works like a charm. But it seems like nothing else included with the system can print. xreader and xed for example, try to print then a little bubble in the corner of the desktop tells me that printing was cancelled. System log...

Jul  3 12:39:29 phantom cupsd[1218]: REQUEST localhost - - "POST /printers/EPSON-ET-4500-Series HTTP/1.1" 200 14039 Print-Job successful-ok
Jul  3 12:39:29 phantom cupsd[1218]: EPSON-ET-4500-Series alan 17 [03/Jul/2019:12:39:29 -0700] 1 1 - localhost notes - -
Jul  3 12:39:33 phantom cupsd[1218]: EPSON-ET-4500-Series alan 17 [03/Jul/2019:12:39:33 -0700] total 0 - localhost notes - -
Jul  3 12:39:33 phantom cupsd[1218]: Print job canceled at printer.

However, LibreOffice Writer (which, I understand, does its own printer magic) has no trouble printing.

I googled around and found some similar issues, all many years old. Those solutions did not help me. I tried getting the print driver directly from Epson. That also didn't help. At this point, I don't really know how to proceed with troubleshooting.

-Alan