And the second "problem": When I was browsing through the internet,
searching for a answer on my first question, I saw images of PCB where
the layer buttons on the left side are colored. Mine are all grey.
In the "Preferences" menu I can set the different layers, but they are
set right.
It's likely a theme interaction. There are some themes where the colors don't
show and I think it's possibly themes that have pixmaps for backgrounds
instead of just colors. I don't know if there is a way around this, but
try some other themes to be sure.
Bill