VNC seems to have died on shellx, I am only getting a blank black screen and cursor when I try to connect to it.  I highly recommend x2go as an alternative, it’s faster, smoother, and supports sound.

I’ll work on troubleshooting VNC but it’s been so many years since I set it up, and it’s such as slow kludge of a program that I haven’t used it in as many years, so it’s going to take some research.