Yeah basically, whenever I try and preview an adaptive skin Zbrush crashes and closes. Any idea why this mite be? I’ve not had this problem before… 
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I realised my problem, I did some searching and found this:
One thing to make sure of is that you’re not trying to use classic ZSpheres features (such as Attractor/Magnet or indented ZSpheres) with the ZSpheres II skinning algorithm. They’re not compatible. If you are trying to use those features, be sure to turn on the Tool>Adaptive Skin>Use Classic Skinning option.