I've just noticed the neew[Import] Panel at right; currently seems inactive, so I guess x1212 is right. Good to know it's not a issue of mine! I just need to update and soon, when ready, I'll be able to use it again.
I know that Godot3 is still under heavy development, and I am fine with: I see G3 will break some legacy backward compatibility... I just want to be ready for when it will be usable. I consider myself still into "early learning" phase... so I can safety step back and forth between 2 and 3.