Thanks @southernrun and @Barliman_Of_Bree (and don't forget that note Gandalf gave you for Mr. Underhill! ;-) ).
It turned out that I had somehow inadvertently paused the course. This is accessed by clicking on the course title on one's dashboard. Then there is a "Pause all chapters" or "Resume all chapters" option as appropriate under the "Course options" list on the right.
Not sure of the best place to ask about this, so here goes: Has anyone else uploaded PGN of a Chess Goals class to Chessable and then had it stop working? I uploaded the Caro Kann PGN several months ago. I worked through some of it, but then turned my attention to other things. Today I tried to resume working through it, but I can't review what I already worked through, nor can I "Learn" the lines I haven't seen yet. To the best of my knowledge, I've done nothing to cause this. Any suggestions?
Hello. My name is Elijah. I’m 1850 uscf and almost 2200 rapid chess.com. My goal is to beat everyone at my local chess club. I am starting the advanced curriculum on Monday! Wish me luck.
Hello every one, I'm Mehdi, from France. I'm currently 600 elo. I just start the beginner plan. I hope we can play together. I look forward to seeing you in front of the chessboard.
Started your advanced beginner course today. I'll let you know. If/when the results come I am definitely down to support you by purchasing your products. You are doing a great thing here!!
Found you on Youtube, downloaded your free Intermediate Study Plan. Thank you, I think all I needed was some structure. This plan takes the guessing out of the equation. Keep you posted on my progress.