Quite a lot of improvement has been done on the Qt print dialog in the last time, so I just retested with Qt's current development version. The problem is fixed there, I can no longer reproduce the issue with it. Since most of the improvements already made it into Qt 5.11, the problem will probably be gone as soon as that version makes it into your distribution. (Some of the latest improvements will only make it to Qt 5.12.) On 2018-03-28 16:33, Stephen Dowdy wrote: > I wonder if CUPS (if it is involved in this process), is doing a live query of the printer via IPP (or other) and the printer itself is configured to default to A4 paper? The IPP attributes returned to CUPS by the printer are used to auto-generate a PPD file for the case where the printer has been set up as an "IPP Everywhere" printer, i.e. without explicitly setting a PPD file (can be done by using the '-m everyhwere' option when setting up the printer via 'lpadmin'. However, this should not play a role here. System or user default settings are supposed to override other default values. Regards, Michael