just follow the links in your segment file and open the fps file of the named segment just run down and check it is all written up correctly in the file. should read like this
;Segment Parts
partmode0 = 0
meshname0 = meshbank\dungeonpack\doorframe1.x
offx0 = 0
offy0 = -50
offz0 = 45
rotx0 = 0
roty0 = 270
rotz0 = 0
texture0 = texturebank\scienceboy\rooms\dungeon_brick_wall_d.dds
transparency0 = 0
effect0 = effectbank\bump\bump.fx
colmode0 = 0
csgmesh0 =
csgmode0 = 0
csgimmune0 = 1
lightmode0 = 0
multimeshmode0 = 0
materialindex0 = 2
and then will repeat heaps. this is a snippet to show what and where.
make sure the mesh is correctly addressed and the texture is in the right place and then it should work
do not have effectbank on if only have one texture, if have all 3 then do effectbank as above
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