i did get a new 'improved' 2010 chainstay; the main section of chainstay is now twice as deep, although the bit that actually broke isn't really any bigger.
i'm not confident about it, watch this space...
(it is the best handling bike i've ever ridden, it's just a shame it's not nearly strong enough).
the Hemlock is a nasty piece of sh*t, and totally overpriced
we've had 2 come through our workshop, and the customers both had exactly the same issue as you, and 1 of these customers has actually broken the "new, improved" part
the suspension design itself is ok, but the frame is completely underbuilt with flimsy tube profiles and tiny bearings in undersized pivots; you can tell that the frame designer really does not understand how to design a suspension frame, its very different to designing a hardtail
best thing is to sell it off, and buy a decent suspension frame from either an established boutique brand (Turner, Santa Cruz, Ellsworth,etc.) or a frame from one of the big brands (Trek, Specialized, etc.)
Cotec make sweet steel hardtails, but design terrible suspension frames (which are made for them in Taiwan)