There must be more to this. To test for a potential problem I loaded up a V2 with ever morphs I have. Then exported a morph injection. Then, in Poser 13 I loaded a completely blank, not even processed with the DAZ exp script. No morphs and no blanks. I applied the injection and everything works as expected.

So it does work. My DAZ content is in a separate library as well. The same library is linked to P12 and P13. That seems similar to your setup.