Hi
A patch for Billund X that fixes this issue is now available here:
http://www.vidandesign.com/support.html
Installation:
1. Reset Billund X to default settings in Billund X Scenery Configurator
2. Unzip billundx_patch2.zip to a temporary folder
3. Run the executable
The patch also fixes an issue with flashing runway and approach lighs in P3D.