Just for the sake of balance and fairness, I have to back up Connie here - there clearly is an issue with joint bending after applying single axis scaling in Poser. As far as I 'm  aware this is a fairly well known Poser issue as well.
Whether or not there are other factors at play with the scaling on the Kids I don't know (I've not really looked at them). It seems this is going to be an issue with future figures though.
As for who's responsibility it is to fix what...it's a kinda six-of-one etc - If Daz are knowingly creating figures that arn't really compatible with Poser then IMO it's arguable that they should make that clear at point of sale (perhaps they are).  On the oher hand, it seems like it'd be useful for SM to take a look at the scaling/bending issues in Poser regardless of anything Daz is producing.

I think another factor gradually coming into play over the last 3 or 4 years is related to improvements of the features in the various apps we use. We're really starting to expect a new level of realism in figures now that we have the ability to do stuff like global lighting etc. Meshes, rigging, morphs and textures are starting to require some rethinks and a new level of refinement to meet these demands. I get the feeling there are a few content creators out there who may start to struggle unless they re-evaluate their practices (that goes for the big boys and Girls at Daz and SM too).

 

PoserPro2014(Sr4), Win7 x64, display units set to inches.

                                      www.danielroseartnew.weebly.com