It turns out that this problem is very easy to reproduce. First some background on my configuration.
The TS-590S has both a USB port and a traditional RS-232 COM port. The USB port connects to an internal USB hub which, in turn, connects to a USB UART for CAT and a PCM2903B USB Audio CODEC. In my station OmniRig is connected to the RS-232 COM port and does not use USB CAT. Starting with WSJT-X connected via OmniRig and connected to rig USB audio CODEC I pulled the rig USB cable I observed WSJ-X report loss of sound interface I went to Settings/Audio and saw Input TS-590 USB Audio CODEC not found I went to Settings/Radio and executed Test CAT - Failed with "failed to start OmniRig server" I restored the rig USB cable I went to Settings/Audio and restored the rig CODEC connection I went to Settings/Radio and Executed Test CAT - it failed. I terminated and re-started WSJT-X. It started with no errors. I see no reason why loss of USB Audio should cause WSJT-X to be unable to connect to OmniRig and think there may be an unintended dependency in the code. 73, Andy, k3wyc
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