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Could you give some more info on what you mean exactly?
I don't know what you are referring to. What do you mean with untextured lines? If they are untextured you would not see them, would you?

Would the background texture be a gp polygon and the foreground texture a gp_line texture, then?

By "untextured", I assume you mean black, i.e., missing texture.
If you instruct ADE to save the compiled file in a folder named "sceney" and there's a companion "texture" folder, the ADE-GP compiler saves any required textures to that texture folder. Otherwise, the textures are saved to a subfolder named "Textures" in the folder to which you have instructed ADE to save the bgls.
The compiler will warn you about any missing textures following a successful compile.
Don
andSelect line and edit:
Was the line still selected when you called for compile?FSX (untextured):

George, life would be so much simpler if you provided your file(s) along with such reports.
To the problem at hand, presumably there was a compile between
Was the line still selected when you called for compile?

The problem is that the line has lost its "straightening". If you edit that line from the file you sent me, you will see that it adopts it's curved shape in the GP Editor.
George, we're going in that "bad direction" again!No it doesn't, I showed you that in the earllier editor screenshot
Don't know. But, once the major issue is resolved, this one likely will go away.Supplementary question. Why does it seem to be textured with only the background in FSX?