is there any reason why 'SetMessage' isn't working?

[ClayPigeon]

TeKataKombs - Actually, 0 will force a calculation of the number of the characters and according to it will set a matching amount of time to read the message.

Thread opener:

The problem's within your language file.
Firstly, you did not end your Inventory category, make it like this:

<CATEGORY Name="Inventory">
</CATEGORY>

And then:
<CATEGORY Name="Messages">
</CATEGORY>

Your syntax was: <CATEGORY/>, which is false.