I had the same problem with WSJT on older firmware (117/116?).? Interestingly, MSHV worked perfectly.? With the latest firmware downloaded from Radioddity (1.1.9/1.1.8) both programs work perfectly for me.
I know this is an old thread, but I am facing the same issues, no output power after first try for FT8.
I managed to made the first and only QSO, but then no transmission.
Afterwards, no output power in any mode with internal and handle microphone,
?
Everything is properly set in radio (or also in software for FT8, where there I have tx, click sound, tuning, tx etx properly working) but without any output power).
I have tried so far 1.1.6, 1.1.7 (the firmware that the radio came with from a SK, and the latest of September 2024). Any ideas/solutions software related? I am afraid that probably something is broken inside the transceiver. Many thanks in advance for any help.