When Poser opens an obj file via a cr2 or pp2 for the first time it creates a corresponding rsr file, there after it reads the rsr not the obj, if the obj is updated the rsr needs to be deleted so Poser can build a new one, quite often the rsr creation does not work properly and the resulting corrupt rsr needs to be deleted. If there is no rsr after you open the cr2 in Poser, then Poser isn't reading the obj. This is probably either because Poser can't find it, or because there is something wrong with it.