As a support tech, you receive several times the same question. This is about one of those things that many user usually forget: courses are not available by default to all centers. When you create a new center, you need to assign the subject areas that can be taught in there. The same happens when you create a new subject area.
To solve the problem, you need to import a file with 3 columns: Center Name, Subject Area Code Prefix and Subject Area Name.
|Center Name||Subject Area Code Prefix||Subject Area Code|
And so on.
In this case, MAT-101 and ALG-201 would be assigned to the Math Center and HIS-101 would be assigned to the Writing Center.
If you want to assign all subject areas to all centers, you might want to use the export feature to get the list of subject areas.