Gee, I could have written *exactly* the same plaint because I too have 22.04 and a 23.04 machines, and yes indeed the 22.04 machine (running 6.6.1) intermittently shows the 3D image while the 23.04 machine (running 7.0.2) shows a blank window.

I tried installing the 7.1 .tgz version, but it has a ...