Frequency Control Test gives this result:Object reference not set to an instance of an object. Please help
Even with the "read freq every 2 seconds" box checked, when I spin the VFO dial, the dial freq is NOT shown in the software???
So you have no Port set in CAT Config so when you try a test there is nothing defined. Set PTT Config to CAT and CAT Config to Kenwood TS-590 and assign a Port.
Would it be possible to see your VarAC settings screen?