Cylinder shader ff workaround
New in PyMOL 1.5.0
Removed in PyMOL 1.7.6
When cylinders (as in stick representation) are drawn incorrectly, enabling this option might fix the problem. This option is often required in NVIDIA's video cards (GeForce and Quadro).
set cylinder_shader_ff_workaround, on
The default is off.
Once you found this option necessary, you can add this to .pymolrc.