I have set (Settings) the pad-to-pad and Track-to-pad spacings to 10 thou. My measured gap is 33 thou for pad to pad so I need a spacing of 23 thou. DRC says gap is 33 needs to be 60. Where does the extra 37 thou come from?
Sorry, don't fully understand where you are coming from. Where does the ".....so I need a spacing (of what?) of 23 thou" come from?
Is there a spacing of 60 thou listed in your (Spacing) Settings table,(might give a clue)? Have you specified an additional "Guard Spacing" for this particular track?