Ok. What happens after the CAT test and you push PTT, does it turn red? Another click on PTT turns if off.
Tested your radio config and it works FB here. FYI, if you have the latest Wsjtx there is a rig option for the QDX that will let you use Split operation by selecting Rig rather than None. It's called QRPLabs QCX/QDX. You might try that. I doubt it'll fix the problem, but it's setup especially for the QRPLabs rigs so you might want to use it.
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Certainly. Here are my setup pages for Radio and Audio. When I test the CAT, the button does turn green. I am able to change frequencies through WSJT-X.
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<dummyfile.1.part>