Im having this issue, simmilar to this post in the forum, but ive revised the entries and everything seems normal. It was working ok, im not sure what happened.
I have disabled the LC through the new configurator to avoid problems with ORBX things, and i feel its not the same as the landclass problem.
This is mi Add-on.XML content:
<?xml version="1.0" encoding="utf-8"?>
<SimBase.Document Type="AddOnXml" version="4,0" id="add-on">
<AddOn.Name>FlyTampa-Toronto</AddOn.Name>
<AddOn.Description>Toronto Pearson International Airport for Prepar3D</AddOn.Description>
<AddOn.Component>
<Category>Scripts</Category>
<Path>scripts</Path>
</AddOn.Component>
<AddOn.Component>
<Category>Effects</Category>
<Path>effects</Path>
</AddOn.Component>
<AddOn.Component>
<Category>Scenery</Category>
<Path>scenery_LC</Path>
<Name>FlyTampa-Toronto_LC</Name>
</AddOn.Component>
<AddOn.Component>
<Category>Scenery</Category>
<Path>scenery</Path>
<Name>FlyTampa-Toronto</Name>
</AddOn.Component>
<AddOn.Component>
<Category>Texture</Category>
<Path>texture</Path>
<Type>WORLD</Type>
</AddOn.Component>
<AddOn.Component>
<Category>Texture</Category>
<Path>scripts\texture</Path>
<Type>GLOBAL</Type>
</AddOn.Component>
</SimBase.Document>
Ive tested changing seasons, moving the priority in Sim Library, reinstalled the product again completely, used ORBX AEC.....no luck...nothing works....

Thanks in advance for support,
Raphael