Esther that would be good news. I started consolidation my runtimes back into one but I am not shure whether I like that process. 
What do you mean by selecting? You can add various runtimes in Poser but only select one. Would adding a runtime to poser solve the problem (theoretically?) I believe to have tried that already (unsuccessfully) but I may need to go through that systematically again.

Cheers

Lukas