Hi Umberto,
thanks to you i checked again about couat and the addon manager and i found this :
i have double checked this : each time i install KIAH couat is disabled in fsx menu.
so, i reinstall gsx on top of the fresh install of KIAH and the appears somes error messages like : ERROR DECRYPTING FILE FSDT_KIAH_T1A.mdl
and same messages for the files : T1B T2B T1C T2C T2A T1E AND T2E .
after all these messages then appears fsx with artefacts , see picture. But here the couat menu is present !
i repeated the installation of gsx and also the vehicle update 7.
Inside fsx , i used the live update of couat without success !
at least, we know that there is a conflict between KIAH and gsx regarding those files...unless you know why !
May be those files are corrupted !
thanks
PS: i just checked if gsx was working well with KMEM wich i have also just installed and you can see on the second
picture that it is okay at KMEM.