I found a bug for Autodesk simulation multiphsics2013.
When you used a Single Analysis with Multiple Load Cases, you will found the results were wrong from load case2 to the end.
Did anyone meet this problem?
That bug was fixed in 2013 Service Pack 1 (SP1). The current version is service pack 2. So please update your software to the current version.
If I remember correctly, the multiple load case bug depended on the size of the model, so the results were not always incorrect.
Simulation Mechanical user since Dec 1997