Hi Chris,
I did more testing with good results. The error when logged in as a student didn't occur again.
(FYI) In my first test, I had backed up the course (with all users) in a life Moodle 3.2.2 site and restored it in the test site with Moodle 3.3. So I thought maybe there is something wrong with backing up and restoring from Moodle 3.2.2 to 3.3.
Then, I created a test course with a teacher and one student and one assignment with a collapsible tab in the description of the assignment. All went well. Course format was topics.
Then, I thought it may be the collapsed topics course format that I liked to use in my first test course. So I backed up the same course but with topics course format selected and restored the course to the test site. The error occurred again i.e., the body of the page was not visible for students. In conclusion: choosing topics format in M3.2.2 (instead of collapsed topics) didn't make any difference. The course format is not the culprit.
One of my questions is: what hinders the body tag to show up in the course main page of Fordson when students are logged in but "This course" is closed? What triggers the body tag when students open the overview "This course" and can see the entire course main page?
The following screenshot shows the elements when a student is logged in but has not opened "This course."
The next screenshot shows you the element after a student has pressed "This course." I hope it makes sense what you see.
Let me know if I can do more tests to find out why students may be unable to see the main class page of some (not all) restored older Moodle courses.
With kind regards,
Hartmut