its normal for the old model to be there as darkmatter can't read new ones (to my understanding that is).
After you import it don't forget to add to map, and when you save the meta before adding to map make sure it is saved in a clean folder so it dont get annoyed
Umm if your using the same version as me (i dont know which that is) if you've added and injected a model into a map close dark matter and reopen then inject another model and add to map it will screw up and spit in your face.
still i don't really know what steps you took to get that message so unless you contact me on aim (very unlikely as im in australia and you're probably america so time diffs and i wont go into the re...plus you don't seem to have aim do you?) email me or post more info here so we can chat and explain what gone wrong then i cant really help.
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THE ABOVE TEXT WAS WRITTEN BY ME AND IT
MAY NOT BE TRUE OR HELPFUL IN ANY WAY
MOST OF THE TIME IT DOESN"T SEEM TO MAKE
SENSE AND DOSEN'T SOUND GOOD NO MATTER
WHAT WAY YOU WRITE IT CHICKEN SANDWICH
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