On Mon, 16 Nov 2020, Artur Bala wrote:
 Dear gretl developers,
 On my MacOS High Sierra 10.13.6, if I "maximize" an output window - be it a
 graphic, a script output or a model window - and "close" it
 eventually clicking on "x", gretl (2020e-git) crashes; all windows get
 closed including gretl's main window. 
That should now be fixed in the current snapshot -- at least it 
works OK on macOS 10.15.7.
This was a mutation of a GTK bug fixed in 2016; a new fix was 
required to work around new Mac behaviour.
Allin