Focus | Attendance / Lesson Monitor | Edit Marks
In Edit Marks, when clicking the 'Codes' button at the top of the screen, nothing happens and the list of attendance codes do not appear.
Also, when pressing a key on the keyboard that does not correspond to a valid attendance code or right clicking and choosing 'Display Codes', the code window does not appear.
Please close and re-open Edit Marks. The codes window will now be available.