Thanks Jeff. I have the number of significant digits at the maximum. In the example I uploaded, changing the 3d object is drawn to 3'5" and the dimension tool shows it at that length. When I change the type of measurement from ANSI to Stacked Fraction, the lenght shown changes to 3'4". The object has not changed, neither has anythign else, just the length shown. Presumably, that cannot be a result of zooming, digits, etc.