When you go to save the model, make sure that in the "Options" area, the "binary" form is checked, and the "compres" is NOT checked.
Other than that, all I can suggest is trying a 3DS with the same paramaters
I use JTEdit for all my Modeling, and I haven't had any trouble before using those settings, so give it a whirl.
Also, if that fails to work, try merging all your mesh's together in the modeler, and then seeing if you can save it out into a format that DB can read.
Failing ALL of that, find the free version of LithUnWrap, and try opening the models in there ( I have found that this is a very, very good guage of if the model is being saved out properly by JTEdit or not, and also as a nifty converter between 3ds and x ).
Jess.

Team EOD :: Programmer/Logical Engineer/All-Round Nice Guy