Setup is Win 10 Pro, WSJT-X v2.3, Icom 7610. Audio via USB1 on radio. Was working ok but transmit audio stopped. The really odd thing is that WSJT 'Tune' worked ok, actual transmit sent no audio.
System restore solved it - had to reinstall WSJTX update. Quick audio settings reset and everything worked again.
Any ideas on what happened? And how to stop it happening again?
I hate Win 10.
73 de M0PTB