What format are the models? .x or .3ds?
( I am assuming .3ds ) I think you should either try exporting it as .x or exporting it as .3ds and find a converter that supports animation convertions.
Also, if you have set the object up with limbs etc that doesn't make it all a single object, then DB will have issues with it. It only uses limbs when you specify them, it can not import them all as one model, you have to export them individually then open them in DB and set up the limb system.
Hope I Helped...
Jess.

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