Broken windows in Coot 1.1.20 stable

[olibclarke]

Hi Paul,

See this screen recording:

https://www.dropbox.com/scl/fi/s4x3e09ovov5wcelhf2cm/broken_windowing_coot.mov?rlkey=k50ari2akqswd9nconwcze5ar&dl=0

Basically, if I open display manager, close it, open shader settings, close that, open display manager again, close that - then when I re-open shader settings for the second time, it is broken and unusable (and cannot be closed).

This is on Mac OS Sequoia, using the stable 1.1.20 version from homebrew (not HEAD, which does not build successfully).

Cheers
Oli

EDIT:
Possibly related? https://discourse.gnome.org/t/gtk4-about-dialog-hangs/18224/6