Subgroups not showing on the Manage Groups page

Symptom: On the Manage Groups page, clicking on the down arrow to show subgroups has no effect. The arrow is toggled but no subgroups are shown.

After investigation, this was due to PHP error reporting configured to show E-NOTICES and to show errors on screen rather than log in a file. These settings are sometimes used on development servers, or as in this case on GoDaddy hosting (yuck ... really?).

As the subgroups list is created through an AJAX call, the E-NOTICE display affects the returned JSON, which cannot then be interpreted.