Sorry I don't have an answer to your meshing question. I am having the exact same problem which led me here.
However, I do have an idea for your other problem. If you are using SpaceClaim, when you go to open the geometry go to File>Open. Select your file type and then click Options. Under Import As try the various options. At least when working with stls I find I can get it to import the individual components by importing the geometry as a "Solid/surface Body".
Hope that helps!
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New Post - Reply To: The mesh generation did not complete due to poor quality elements or incorrect input.