Advanced settings GUI
The GUI for managing lists of white-/blacklisted INSTCODEs is not intuitive:
User has to hit Enter key to add an item, it is not clear what the "Save" button does and removing of items is using a web-like UI.
Changes
The section "Selected Institute codes" should have: A label "New entry", followed by text field, followed by "Add to list" button.
Use the standard List box with multi-select enabled. Add "Remove" button (enabled if there is anything selected).
Remove "Save" button.