09-13-2010, 11:00 AM
If your master node isn't part of the structure (e.g you have introduced it at the geometrical center) make sure that is properly supported. It''s support must block the degrees of freedom that have been considered free in the rigid diaphragm (UZ,RX,RY should be blocked.)
Your last images shows that you 've left some direction unblocked.
Your last images shows that you 've left some direction unblocked.