1. The lower numbers (most recent additions) are loaded last; so tha default stuff is superseded by the more recent addons.
2. This is my TERRAIN section, with no disappearing objects:
[TERRAIN]
TERRAIN_ERROR_FACTOR=100.000000
TERRAIN_MIN_DEM_AREA=10.000000
TERRAIN_MAX_DEM_AREA=100.000000
TERRAIN_MAX_VERTEX_LEVEL=21
TERRAIN_TEXTURE_SIZE_EXP=8
TERRAIN_AUTOGEN_DENSITY=5
TERRAIN_USE_GRADIENT_MAP=1
TERRAIN_EXTENDED_TEXTURES=1
TERRAIN_DEFAULT_RADIUS=10
TERRAIN_EXTENDED_RADIUS=10
TERRAIN_EXTENDED_LEVELS=1
Maybe yout default and extended radii are too low at zero? Also, you might have overlapping sceneries that may be conflicting.
