Hi there!
I have the same problem too. Purchased GSX on release date, installed it and all worked perfectly. But the next day, the couatl-menu went away from the add-on-menu.
Starting the couatl.exe manually brings the menu-item back and all works normally.
Reinstalling GSX as noted in this thread (with deactivated antivir etc.) doesn't help to solve the problem.
The Simconnect Diagnostic Output stays empty, th eonly text which is shown is:
"0.00000 SimConnect version 10.0.61259.0"
This is my dll.xml:
<?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>Addon Manager</Name>
<Disabled>False</Disabled>
<ManualLoad>False</ManualLoad>
<Path>bglmanx.dll</Path>
</Launch.Addon>
<Launch.Addon>
<Name>ObjectFlow_W52.dll</Name>
<Disabled>False</Disabled>
<ManualLoad>False</ManualLoad>
<Path>E:\FSX\ORBX\FTX_NA\FTX_AA_W52\scenery\ObjectFlow_W52.dll</Path>
</Launch.Addon>
<Launch.Addon>
<Name>ObjectFlow_1WA6.dll</Name>
<Disabled>False</Disabled>
<ManualLoad>False</ManualLoad>
<Path>E:\FSX\ORBX\FTX_NA\FTX_AA_1WA6\Scenery\ObjectFlow_1WA6.dll</Path>
</Launch.Addon>
<Launch.Addon>
<Name>VistaMare Core</Name>
<Disabled>False</Disabled>
<ManualLoad>False</ManualLoad>
<Path>VistaMare\ViMaCoreX.dll</Path>
</Launch.Addon>
<Launch.Addon>
<Name>PMDG HUD interface</Name>
<Disabled>False</Disabled>
<Path>PMDG\DLLs\PMDG_HUD_interface.dll</Path>
<DllStartName>module_init</DllStartName>
<DllStopName>module_deinit</DllStopName>
</Launch.Addon>
<Launch.Addon>
<Name>Object Placement Tool</Name>
<Disabled>False</Disabled>
<ManualLoad>False</ManualLoad>
<Path>..\FSX SDK\SDK\Mission Creation Kit\object_placement.dll</Path>
</Launch.Addon>
<Launch.Addon>
<Name>Traffic Toolbox</Name>
<Disabled>False</Disabled>
<ManualLoad>False</ManualLoad>
<Path>..\FSX SDK\SDK\Environment Kit\Traffic Toolbox SDK\traffictoolbox.dll</Path>
</Launch.Addon>
<Launch.Addon>
<Name>Visual Effects Tool</Name>
<Disabled>False</Disabled>
<ManualLoad>False</ManualLoad>
<Path>..\FSX SDK\SDK\Environment Kit\Special Effects SDK\visualfxtool.dll</Path>
</Launch.Addon>
<Launch.Addon>
<Name>Captain Sim Menu</Name>
<Disabled>False</Disabled>
<Path>Captain_Sim\Captain_Sim.b757.menu.dll</Path>
</Launch.Addon>
<Launch.Addon>
<Name>Captain Sim 757 Sound</Name>
<Disabled>False</Disabled>
<Path>Captain_Sim\757\cs.sound.dll</Path>
</Launch.Addon>
<Launch.Addon>
<Name>FSUIPC 4</Name>
<Disabled>False</Disabled>
<Path>Modules\FSUIPC4.dll</Path>
</Launch.Addon>
</SimBase.Document>
and this is my exe.xml
<?xml version="1.0" encoding="windows-1252"?>
<SimBase.Document Type="Launch" version="1,0">
<Descr>Launch</Descr>
<Filename>exe.xml</Filename>
<Disabled>False</Disabled>
<Launch.ManualLoad>False</Launch.ManualLoad>
<Launch.Addon>
<Name>Couatl</Name>
<Disabled>False</Disabled>
<ManualLoad>False</ManualLoad>
<Path>fsdreamteam\couatl\couatl.exe</Path>
</Launch.Addon>
</SimBase.Document>
Nothing changed at this two files since first installing of GSX. The onyl problem seems to be to start the couatl.exe at fsx-startup.
Hope my discription helps to solve the problem, 'couse I would love to use GSX without those problem, it's a great product!