Could be, or maybe my model throws JT for a loop for some esoteric reason, or maybe there is an issue with my system. I've certainly spent enough time trying to get it to work and fiddling with parameters to know that I really don't care why. I'm just saying that the other exporter might work for you if JT doesn't work.
I've spent many many frustrating hours using DirectX exporters on more than one software package to finally be able to have boned mesh deformation working for me in DBpro. It's a VERY finicky process (in my opinion - some may have had no difficulties, although I have seen other posts from frustrated users in this forum).
I think it's best for those going into the process to know what HAS worked for others in order to save them time, so I'm just saying that the other exporter works for me.
"If you want an audience, start a fight."
- Gaelic Proverb