Ok, I've abandoned Folder Actions as it just doesn't seem to work. I've now gone with an always-running #AppleScript to scan the folder.
And.. it works! Almost? It seems that MacPalette II crashes (and takes Acrobat Reader with it) after it completes a print and there's a finder dialog that's proving difficult to dismiss in AppleScript.
#RetroComputing #VintageApple #VintageMac