Make sure you have selected the entire object. try hitting "A" and use the free move feature to double check that the model is completely selected. Blender has two directx exporters. Which one did you use (the first or second one)? Blender is known for janky .X exporting. it seems to export to most of the other file types consistently. Can you add an email address to your profile so I can contact you off board about this issue. I am pretty good with blender. I moved modeleling platforms do to certain needs and comfort.
Regards,
RF
Reality Forgotten Dev Forums
In my case, you know, I hate to advocate drugs or liquor, violence, insanity to anyone. But in my case it's worked.