Created attachment 436356 [details]
Output when running with pyopengl-3.0.2-r1
Although I’m not entirely sure which package actually needs the updated dependency, changing from dev-python/pyopengl-3.0.2-r1 to 3.1 made m64py run flawlessly.
As a side note, I installed (Py)Qt5 with stripped down use flags.
dev-python/PyQt5 -dbus -declarative -network -printsupport -sql -svg -xmlpatterns
This one is kinda hard. m64py doesn't really require pyopengl, except it uses it to apply some nvidia-related hack when it is present. I'd rather not add an unnecessary dependency.