also if you have DBP 5.2 there are MANY times that it messes up models that were not made/exported with GameSpace, that may also be a cause...
they say they are working on fixing it before they let out the next upgrade... but not for sure about the current status on it... try re-patching to 5.1 and see if the models work correctly
you DO NOT need to un-install everything to downgrade to 5.1 from 5.2... before i get flamed for this... try it... i have popped from 5.1 to 5.2 and back SEVERAL times lately... trying to get things to work... it CAN be done!