Wierd DLL.XML file behaviour re: Addons Menu - Help Anyone ?

Hi All,

Not anything specific relating to PMDG but the PMDG guys appear to know their XML files and I have followed their advice about using Notepad++ to ensure it is saved in the correct format.

Problem is that whatever I install into the DLL.XML file, only the item on the top of the list and FSUIPC (always at the bottom), appears in the Addons menu in FSX (Win 7).

So, I only have 2 modules loaded into the Addons menu. Wierd Huh ?

Here is my XML file with two items plus FSUIPC installed -

<?xml version="1.0" encoding="Windows-1252"?>

<SimBase.Document Type="Launch" version="1,0">
  <Descr>Launch</Descr>
  <Filename>dll.xml</Filename>
  <Disabled>False</Disabled>
  <Launch.ManualLoad>False</Launch.ManualLoad>
  <Launch.Addon>
    <Name>Instant Scenery</Name>
    <Disabled>False</Disabled>
    <ManualLoad>False</ManualLoad>
    <Path>C:\Flight One Software\Instant Scenery 2\InstantSceneryFSX.dll</Path>
  </Launch.Addon>
  <Launch.Addon>
    <Name>Airport Studio</Name>
    <Disabled>False</Disabled>
    <ManualLoad>False</ManualLoad>
    <Path>C:\Flight One Software\Airport Studio\AirportStudioFSX.dll</Path>
  </Launch.Addon>
  <Launch.Addon>
        <Name>FSUIPC 4</Name>
        <Disabled>False</Disabled>
        <Path>Modules\FSUIPC4.dll</Path>
    </Launch.Addon>
</SimBase.Document>

All the black and white boxes are present and correct, but only FSUIPC and Instant Scenery show up in the Addons menu.

Now, if I switch the two modules: Instant Scenery and Airport Studio,in the file, so IS is below AS, only the AS shows up in the Addons menu, together with FSUIPC.

This happens however many items are in it. Only FSUIPC plus the ONE module "at the top of the list", show up.

Hope someone has some ideas.