When trying to connect to the Atlas cluster for M001 (connection details in the lesson text), I was able to successfully connect using the given credentials.

When I tried to reproduce a student's issue by connecting without a RS name, I got this error:

An error occurred while loading navigation: 'not master and slaveOk=false': It is recommended to change your read preference in the connection dialog to Primary Preferred or Secondary Preferred or provide a replica set name for a full topology connection.

It was clear that I (and the student) needed to specify the name of the replica set. But when I added the RS name back to Compass, I received the same error. Every attempt after the first failed attempt was a failure as well. It didn't successfully connect again until I restarted Compass, so I think it's caching something about the failed attempt.

I am using version 1.13.1, the one currently on the Compass downloads page.