Custom maps no longer showing

[Merryweather]

After a few months' break, I'm back in the game. I'm afraid, however, that I always have this problem: the game custom maps like Greater Faydark, Steamfont or Neriak don't show. When I press M, it's the World map that pops.

I'm surprised that no one replied to this post. Am I the 1st to experience that bug ?