When either mole or mass basis is chosen in Options > Units > Composition, plots rendered in Plot > T-x Diagram or P-x Diagram are always in mole fraction, however, the x-axis label will reflect the choice. So when mass fraction is chosen, the display is in spurious.
The attached image shows this for the arbitrarily chosen binary R-134a / Propane. The python plots are what I would expect to be rendered.
When either mole or mass basis is chosen in Options > Units > Composition, plots rendered in Plot > T-x Diagram or P-x Diagram are always in mole fraction, however, the x-axis label will reflect the choice. So when mass fraction is chosen, the display is in spurious.
The attached image shows this for the arbitrarily chosen binary R-134a / Propane. The python plots are what I would expect to be rendered.