saving units doesn't work (looks like it saves, but doesn't), and mysqli_get_server_info w

Hi Support,

I have a new test site I setup for a client. They want to use CoursePress Pro!

However, when my client (McKenzie) tried to create the first Unit for the first Course, it looked like it saved - got a little pop-up notice that it saved as well. The "(1)" also appears on the tab in the interface. However, if you navigate away to any other page and come back, the unit is gone. I've done this as well with the same result.

I have granted access already.

This is a TEST site and there is no real content (yet) - so please do whatever you need to do.

Also, under wp-admin, this warning has appeared:
Warning: mysqli_get_server_info() expects parameter 1 to be mysqli, resource given in /home/wdwalr/public_html/divi/wp-content/plugins/wpmudev-updates/template/support-system.php on line 77