Bryan,
I had problems similar to yours when I upgraded to edy555's 0.2.3. After calibration my open and short loads on the Smith display stayed centered around 50 ohms and my through measurement was about 10 dB down. I never had similar issues using the previous firmware. My problem turned out to be the "Correction" setting under the "Cal" menu. In the previous firmware it was turned on by default, so I wasn't aware of its function and thought it was an advanced user setting like electrical delay. When I upgraded to edy555's 0.2.3 firmware "Correction" was turned off by default, and therefore; OSLT calibration was not being applied. Once I toggled that setting ON then 0.2,3 worked great and is the best version to date.
-Herb
