Your mods are dependent on GM stuff? Other than that, not sure why that's not working. I'll look into it soon.
Baard, seeing as you have already done a stats editor livestream, maybe you could make a small "Making a skill mod from the very start" video? That way people like me or Koun would be able to follow and see if it's a technical problem or something we are doing.
Something to expand on the rather bare official tutorials, start from the very beginning, to copying an existing skill for modification -> Seeing it in GM Mode for testing.
The story integration via skillbooks is another issue for another time but something to help visualize the basics would help a lot of people from the get go.