I tend to find this system works well for me.
I use Blender as normal, then export the file to obj.
Use Wings 3D to import the obj file, then use Wings 3D to export again to obj.
Not sure on what Wings 3D does differently to Blender, during the export process thought, but 99% of the time, I import the obj into S3d, and away I go.
Yet with Blender exports only, I used to get all sorts of issues, including CTD's in game.
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