One known limitation has to do with 32 bit versions of Poser like Poser 9 and the apply active morph script in the importer.

Due to the memory limitations of 32 bit versions, Poser can be slow to apply the morphs or the library can lock up altoghether.  Sometimes there's no way to know if it's just slow or you've hit "library lock" until you click on the library pane and nothing happens.

Use of an external library app can help this.

It's been stated several times over at DAZ that the DSON importer needs a script to turn it off once it gets started.