Thanks a lot for your suggestions. In fact, “M-x list-colors-display” produces the following baffling error message:
After getting this error, I checked the Messages buffer and found the following lines:
Unable to load color "grey75"
Unable to load color "gray75"
Unable to load color "dark red"
Unable to load color "gray75"
Unable to load color "gray50"
Unable to load color "gray75"
Unable to load color "gray50"
Unable to load color "gray75" [3 times]
Loading delsel...done
Loading paren...done
Loading /Users/artemio/.session...done
For information about GNU Emacs and the GNU system, type C-h C-a.
Unable to load color "Firebrick"
Unable to load color "RoyalBlue3"
Unable to load color "dark slate blue"
Unable to load color "darkseagreen2"
Unable to load color "gray75" [2 times]
Unable to load color “gray50"
So it looks that after the newest developer beta Emacs has problems finding most (all?) colors. Does that make sense to you? Any fixes/workarounds that come to mind?
Thanks a lot,
Artemio