Courses without lessons

I’ve seen that in Guided Courses there are some courses in black and white that don’t have any lesson at all but still have thousands of new words. Is this a bug? And also other black and white courses that have lessons I can access. What’s that mean?

Hi Adrian,
Courses in black on the Guided Courses tab are courses which you haven’t studied yet. As soon as you open a course and start a lesson from it, it will change to colored version.
Courses with 0 lessons are courses which lessons were made private by content provider and this courses should not appear on this list. We will get that fixed.