I've just upgraded to Inkscape 0.92.0 r15299 and have also noticed a change in behaviour with scaling for DXF export. It used to be that to get the correct scale in my laser software I needed to save off with the DXF option "Units: mm". Now 0.92 generates a file with the wrong size with "Units: mm" but the right size with the export option "Units: px". That's counter-intuitive! Something about DXF export scaling has gone screwy! It's definitely to do with export, not import.
I've just upgraded to Inkscape 0.92.0 r15299 and have also noticed a change in behaviour with scaling for DXF export. It used to be that to get the correct scale in my laser software I needed to save off with the DXF option "Units: mm". Now 0.92 generates a file with the wrong size with "Units: mm" but the right size with the export option "Units: px". That's counter-intuitive! Something about DXF export scaling has gone screwy! It's definitely to do with export, not import.