Hi @Jim. It seems like Khan Academy has made changes to which categories videos are placed. On the demo.learningequality.org (0.16.9 release), you might have seen more available categories compared to the 0.17.1 release. So it might look like they aren't available, but they are. It's just that they were just moved.
So for example, you want to watch 'Adding functions' video. Which is located in Math -> Algebra II -> Manipulating Functions -> Combining Functions
But now, in the 0.17 release, they are located inside Math -> Algebra -> Functions -> Combining Functions