My mistake, spurious lines are present when the the file is used to create Gerber plots under 4.0.5 Win 64 and 4.0.5 Ubuntu 64 bit stable from the PPA
My mistake, spurious lines are present when the the file is used to create Gerber plots under 4.0.5 Win 64 and 4.0.5 Ubuntu 64 bit stable from the PPA