first of all thanks to the guys from Havok for releasing the SDK! :)
Running the Simulation i ran into the following error and two of my three hkpExtendedMeshShapes won't collide. I get the following output:
.CollidehkpSimpleConstraintContactMgr.cpp(290): [0x11fce585] Warning : 'Maximum number of ContactPoints reached,
dropping points. Note: This message is fired only once and it means that one object has too many triangles in a specific area'