I've just installed WSJT-X 2.4.0-rc1 on MacOS Mojave 10.14.6 with an Icom IC-9700. I did apply the sysctl.conf changes. The program starts fine, I can test the rig connection, test PTT, etc just fine. After about 30 seconds the window just closes. No error, no popup, just poof.
I checked the wsjtx_syslog.log and sometimes it adds nothing to the log, sometimes it adds a single "[" character.
If I unplug the USB cable to the radio, WSJT-X starts fine with the expected "Rig Control" error popup, but once I click OK on that, the program stays running. It seems to only close when the rig is connected.
Everything was working fine on a previous version of WSJT-X.
(Sorry if this post shows up twice. I submitted it earlier but it never showed up.)
Thanks & 73