We had almost the same issue a few month ago: Upgraded a long standing
application from v13 to v15.2, near 80 Clients, 99% Mac Clients and a
Windows 7 Workstation as 4D Server (VMware esxi; central Storage). Every
2nd day the 4D Server App  stands still, Clients gets no response. After
restarting the 4D Server App everything runs normal (until ist stopps again
after one or two days). Half the time, we could quit 4D Server App via
menue, half the time we had to kill the 4D Server App process via Task
manager.
We´ve done a lot of things to find the Error, Thomas Maul´s focus was at
the Storage Speed (IOPS, see his Summit Presentation). I suspect that a
complete Maintenance of the 4DD and full rebuild of the Index (trash the
.4DInx)  has fixed the problem. Previous checks of the 4DD via MSC has
shown no Problems before.

2016-09-07 14:50 GMT+02:00 Jeffrey Kain <[email protected]>:

> I suppose you've looked at your OS X crash logs already, and turned on
> client-side debugging to find out at what line(s) of code the application
> crashes? Any clues there?
>
> > On Sep 6, 2016, at 10:53 PM, Ronnie Teo <[email protected]> wrote:
> >
> > Hi All,
> >
> > I had a client who recently upgraded a long standing application from
> v13 to v15.2 running in a pure Mac environment.
> > What used to be a very stable application, now crashes almost every
> alternate day under El Capitan, Mac OS 10.11.5.
> > Both the server and all workstations are running the same OS.
> >
> > I wonder if anyone has experienced this and what remedies, if any are
> available?
>
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