sabaton Only when I install system updates and restart the system do I have the black desktop again.
There's a simple answer to all things GNOME, and it's so simple I even hesitate to mention it. Solus provides three other DEs that are all easier to deal with than that GNOME. Although I've been a Plasma user for a very long time, I'm quite impressed with the new Xfce DE. There are still a few small warts that might not even matter to most folks, but it works perfectly in VBox using the VBoxSVGA video adapter, and provides a full range of resolutions, including the popular 1920x1080. And that's without needing the guest additions to be installed.
Since you obviously have VBox available, why not create a quick VM for Solus Xfce and take a look?