> I seem to recall that there was a point, previously, during which some Macs 
> needed to have a memory range tricked out.  That was done with the Mac Mini, 
> and it then worked fine with earlier versions of both the OS and the WJST 
> package.
> 
> Is that still an issue.  Did the OS update wipe it out?

Hi Jim,

You may need to increase the shared memory allocation if you are running the 
stock configuration of MacOS. The instructions can be found in 
src/Darwin/ReadMe.txt file, which was prepared by John, G4KLA. Here’s a 
relevant excerpt from that file:

'After the reboot you should re-open the Terminal window as before and you can 
check that the change has been made by typing:

  sysctl -a | grep sysv.shm

If shmmax is not shown as 14680064 then ... WSJT-X will fail to load with
an error message: "Unable to create shared memory segment”.'

Here’s what I get on this laptop, which is running MacOS 10.14.2 and which runs 
WSJT-X just fine:

$ sysctl -a | grep sysv.shm
kern.sysv.shmmax: 14680064
kern.sysv.shmmin: 1
kern.sysv.shmmni: 128
kern.sysv.shmseg: 32
kern.sysv.shmall: 17920

If your shmmax parameter is smaller than 14680064, I recommend that you follow 
the procedure that is explained in the ReadMe.txt file.

Regards,
Steve k9an

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