Hi, there is no G2/G3 in the gcode (and no reduction in gcode size) using the Marketplace version of the plugin on Cura 4.8.0, OS-X Big Sur 1.2 Beta (20D5029f). I checked that ~/Library/Application Support/cura/4.8/plugins/ArcWelderPlugin/bin/osx/ArcWelder is 'chmod +x' and I can execute it from Terminal.
Also tried the dev version posted in an earlier comment (ArcWelderPlugin-v7.0.0-2020-11-30T10-46-32Z.curapackage), no difference (except I had to chmod+x the binary).
Attached 'tail' from cura.log during a slice--don't see anything in the log about Arc Welder other than the arc_welder settings being passed to CuraEngine. Am I missing something?
I tried various settings including reducing 'Resolution' and disabling the Min Arc Segments (since I have Marlin 2.0), but no difference.
FWIW, the OctoPrint plugin works (proving the original gcode isn't faulty).
cura-arcwelder.log