Are there any log files that I could look at (on either end) to help me
verify whether this is indeed the problem?

On Thu, 22 Sep 2016, Tom Lane wrote:

Brandon Allbery <> writes:
That would be the exact symptoms of the X11ForwardTimeout issue; the older
app will keep its display but new ones will be rejected.

Yeah.  Maybe the connection to the Sierra upgrade is that the updater
failed to carry over some config file in which the OP had fixed this

                        regards, tom lane

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