I only just downloaded 1.6.7 today, and the GUI fails to open in both the Appimage and .deb versions.

I also get different error messages depending on which version of 1.6.7 I'm using, along with some other strange behavior.

1.6.6 still works fine.

It would take a while to describe every detail of this in text, so here's a video showing the issue. My neofetch information is included at the end, in case that's helpful.