Problem configuring project structural shapes

I'm using AECOsim v8i SS5, and am having trouble setting up an area in my project to store "special" structural sections.

I have the GB dataset structural shapes loaded in place 1, and the location of my project dataset's "ProjectShapes.xml" in place 2 of STRUCTURAL_SHAPES variable (see below image). 

ProjectShapes.xml contains the following:

<?xml version="1.0" encoding="Windows-1252"?>
<TriForma>
	<StructuralShapes>
	  <Code name="Project Shapes" isMetric="true"/>
	</StructuralShapes>
</TriForma>

I expect to be able to select "ProjectShapes" in the code drop-down of the structural sections selector, however it does not appear (see below):



If I click File > Open from "Structural Sections", the entry for "ProjectSections" does not appear but UK.xml does (see below):




I can manually navigate to "ProjectSections.xml" in the above dialogue, and add it there, but it doesn't affect the "Code" drop-down, and the entry disappears the next time I do File > Open. It is as though it never got attached / recognised.

I have tried making a renamed copy of UK.xml in the project location (instead of the blank / empty "ProjectSections.xml"), but I am getting the same behaviour.

Does anyone have an idea of what I might be doing wrong?