From CCP4 wiki
set_hardware_stereo_angle_factor(0.5) # for the Python fans
Hardware stereo failure: try (set-display-lists-for-maps 0)
;; or maybe 1 in coot 0.9 - see https://www.jiscmail.ac.uk/cgi-bin/webadmin?A2=ind2002&L=COOT&P=R312
==== Zalman Stereo ====
Q: Is it possible to deactivate the nomenclature errors check? Sometimes this check is not very useful and it becomes rather annoying when one has several molecules loaded only wants to look at the structures...
A: Add to your ~/.coot or whatever: