Please be patient with the lesson builder. If you encounter any issues with it, no matter how small, please post a message here, or leave a comment in the builder itself. When reporting a bug, please read this first.
We are continually working on the lesson builder, which may occasionally mean that what worked yesterday may not quite work the same way today.
New features are added to the beta version first, and will be announced here. Anyone wishing to test the beta version can go to the ‘My Profile’ page to do so. Any feedback will be welcome, even negative.