Have 1.3 (48) and I know you acknowledged this issue above, but I have found a new wrinkle…
When Resistance is on the top screen….
“Zero” does nothing.
When Resistance is on the bottom screen…
“Zero” sets to -7.89.
(IMHO I am getting very confused as to which readings can be put on top and which on bottom. If I had my druthers, I would vote for radio buttons or a simulated selector switch like on a Fluke. But that is me thinkin crazy)