isn't 25000 near milkshape's limits? that may be the issue
Quote: "What are the limitations I should consider when modelling?
There are limits to the number of vertices, triangles, groups, materials, joints and keyframes allowed in MilkShape 3D, it is important to consider these limitations when modelling.
Vertices: 8192
Triangles: 16384
Groups: 128
Materials: 128
Joints: 128
Keyframes: 256
These are the definitions taken from the MS3D file format 'ms3dspec.txt.c' from the MS3D SDK. While your model/s may exceed some of these limitations, the limitations shown here are the limitations under which you will see predictable behaviour when using MilkShape 3D. It is not known what would happen (in respect to the behaviour of MilkShape 3D) to models which exceed these limitations.
"
straight out of their FAQ in the help docs.
remember milkshape was created for making game content.
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