Instability issues
http://forums.autodesk.com/t5/forums/searchpage/tab/message?location=forum-board%3A351&q=instability...
Rafael Medeiros
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Accepted solution
It is caused by robot FE type. It is better no to "support" panel in only one node - artifical mathematical instability may appear.
Workaround: add one rigid link as shown below:
Rafal Gaweda