Weird GNUPLOT problem

[Dave Horsfall]

MacBook Pro (early) with Sierra (all updates); can't be more precise than 
that because "About This Mac" is no longer displaying anything (SMC reset 
required?) since a reboot, but that's not my immediate problem.

Gnuplot Version 5.2 patchlevel 8    last modified 2019-12-01

When trying to save a graph (any graph) I get as far as "Save As" and I 
get the dreaded spinning beachball instead of the file selection; I've 
waited up to an hour before killing it by doing in AquaTerm.  This started 
happening after my Monday "port upgrade outdated", so I'm guessing that I 
now have a bad library somewhere as a result of the upgrade?  There were a 
few library updates, as I recall...

I'm trying to figure out whether this is a Mac/Gnuplot problem or a user 
error, so I'm wondering whether others have seen this before I report it 
as a possible Gnuplot bug (but I can't see how it could be, because it 
wasn't touched as such).

Thanks (and yeah, I have a few outstanding replies to follow up)

-- Dave