Quote - okay, I just tested around a bit.

First launch PPro 2010, then PPro 2012. In this case, the PPro2010 Lib sends stuff to PPro2010 while the PPro2012 Lib sends stuff to PPro 2012. This is what we want.

First launch Ppro2012, then Ppro2010. In this case the Ppro2012 Lib sends stuff to PPro2012 while the PPro2010 Lib also sends stuff to PPro2012.

Apparently, the PPro20102 Lib sends stuff to PPro2012 while the PPro2010 Lib sends stuff to the PPro which was launched first.

Simple solution: launch PPro2010 first.

Switching the PPro (2012) Lib to Embedded does not make a difference.

 

But that doesn't seem to work as I tried that yesterday several times. Even if I launch PP2010 first, it still has the PP2012 library automatically and the 2010 one never shows up. It also automatically contains an additional external runtime which I normally use for 2012, even though I never added it to 2010. Even when I've just installed PP2010, it contains these two libraries in its factory state. I should have to add these myself manually (which should be the case for any Poser program).  

And even when I did launch PP2010 first yesterday, and then opened 2012 second, 2012 still sent stuff to 2010, whereas if I launched 2012 first, then 2010 would send stuff to 2012.

So it seems really, when I'm launching PP2010, it's actually launching another copy of 2012 somehow instead of an independent copy of 2010 which is unconnected.