Text Styles within Dimensions Styles not quite working - CE U4

Hi All,

I'm certain I am missing something really basic here. 

I have created both text and dimension styles and stored them inside the same dgnlib entitled 'TextDimStyles_COP.dgnlib'. I have located this dgnlib on our network within the Organization\Dgnlib folder.

MS_DGNLIBLIST is defined at organisation level  (this is not defined by me at any other level):

MS_DGNLIBLIST               > $(_USTN_ORGANIZATION)dgnlib/*.dgnlib                  # Design library files

I have ensured that the text within each dimension style points to a corresponding text style of the required height/font etc. I have attached our dgnlib here.

The problem is that when I place a new dimension inside a normal dgn, the library text styles are ignored and the dimension text reverts to the Style(none) by default.

Any ideas?

See dgnlib and dgn screensshots below:

DGN lib:

DGN file:

 5353.TextDimStyles_COP.dgnlib