We have a fairly large model that I can't share in these forums. Our project is a model of models with project usages, etc. We have an issue which is repeatable where if a user selects certain elements, diagram info for example, and changes from expert in the specification to all, Cameo goes into an infinite loop and the only way to recover is to end the Java task via the Windows task manager. 

The only way to overcome this issue is to relaunch Cameo, create a dummy element and change the specification default back to expert from all. 

Any ideas what might be causing this behavior? I can't seem to recreate this issue in a smaller model. 

Thanks in advance,
Sam