The simulation seems to run fine now after a slight change in the RigidMapping as the follwing:
Replacing
<RigidMapping rigidIndexPerPoint="0 8 8 8 8" />
by:
<RigidMapping template=”Rigid3d,Vec3d” name=”rigidMap1″ rigidIndexPerPoint=”1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 3 3 3 3 3 3 3 3 4 4 4 4 4 4 4 4″ />
and
<RigidMapping template="Rigid3d,ExtVec3f" rigidIndexPerPoint="0 8 8 8 8" input="@.." output="@Visual" />
by:
<RigidMapping template=”Rigid3d,ExtVec3f” name=”rigidMap2″ rigidIndexPerPoint=”1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 3 3 3 3 3 3 3 3 4 4 4 4 4 4 4 4″ />