I just published and uploaded my first course for testing, hooray! I expected gremlins and found that a single module did not navigate to the remaining course and therefore stopped. Have I missed something?

Modules, courses and reusable content models......
All of the output types in courselab are built around SCORM (Sharable Content Object Reference Model)which is just a set of standards and specifications defining web based e-learning.
# Learning objects are a way of thinking about learning content. Traditionally, content comes in a several long chunks. Learning objects are much smaller units of learning.
# They are self-contained – each learning object can be taken independently
# They are reusable – a single learning object may be used in multiple contexts for multiple purposes
# They can be aggregated – learning objects can be grouped into larger collections of content, including traditional course structures
So a single module is a component of a larger whole, a course. The aggregation of these isn't handled at the component level but at the course level. Usually this aggregation service, combining the low level modules into a complex course is provided by an LMS.
.. It depends how you built this to start with and how it is to be delivered