I opened the model saved in Simulink 5.1 (R13SP1) in Simulink 6.0 (R14). I received the following error message:
Erroneous feedback connection involving one or more virtual blocks starting at output port 1 of 'Vmodel/1 Ctrl_SIM/1.1 PowerTrainManager/1.1.2 ControllerState /Bus Selector1'
However, it does not look like there is a feedback connection in my model.
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