Hi Dorin
My 2-core 2.16GHz 3MB RAM laptop "didn't like" SH3D 6.1.2 when I installed it, so I had to roll back to v4.3.
However, I've now built a dedicated "Media Machine" with improved specs running Debian 10 and I can now run SH3D 6.1.2 without it freezing up when I try to do basic tasks... like render a simple scene.
I didn't know how to use the Library Editor so I didn't know how to limit the exported library file to just the things I created - as I said in my earlier post.