JTDX on the Mac is quite buggy and often will stop sending audio out to the USB
port.
Corey, what Mac are you using? I know WSJTx on some old Macs have similar issues. When I was using WSJTx on my 2010 Mac mini with IC705, the audio stream sometimes would be routed to the internal speaker. The workaround is surprisingly simple - just change the sample rate of the radio's virtual sound card from 48kHz to 44.1 kHz. It can be done in "Audio MIDI Setup". Don't know if this is relevant though.
