Yes, the DSON is compatible with P9 and up.  One of the biggest issues with P10 is that it is a 32bit app.  This can lead to issues with the Poser library locking up on you.  Especially when you use the apply active morph scripts.

Another issue is not having things in the correct place.  The Genesis Starter essential files and the Poser Companion files need to installed to the same runtime.  Best way is to set up a separate external runtime for5 this.  Poser also must be allowed to write to this runtime.

When you load the figure is it listed in the figures drop down at the top of the view port but not showing in the view port?  Are you up to date on the SR's and are your video drivers up to date?