Could it be that the path to your FS is not set correctly in Ground2k4? I just checked my Ground2k4 folder and could not find files defining these lines there. So I think they are read directly from the terrain.cfg file.
I've a trouble with roads. I'm buiding a scenery with PhotoScenery Maker for the photoreal slice, Gmax and EOD for 3D objects and FSSD for other little things.
Now I'm adding roads with Ground2K4 and during the test, with my big surprise, the roads are visible only during night, dawn and dusk but not on the daylight.
Anyone has an idea about this?
If you made your photo scenery with resample (and I think the Photoscenery Maker does that), then you can not display VTP lines and polygon on top of it. So probably at night your photos are not shown and you see your roads again.
If you want to place them on your photos, you need to place the photos with VTP polygons. SBuilder does for example support this.
No, the registered version only gives you a couple of more advanced functions, such as importing/exporting various standard formats. SBuilder works from scratch, so I can not say that I have an answer to that.
Have you added the scasm.exe ver. 2.95/.96? That one is necessary to enable compilation of scenery.