My coworker has an assembly that when you open it none of the parts show up, and Solid Edge ST9 in stuck in sketch mode. I can turn on the sketches and see them, but the parts are not visible, and it will not close out of the sketch mode. However, when he edits the assembly from a higher level assembly everything functions normally. He just cannot open the assembly and work on it. Very odd. Even saving the assembly as a new name doesn't solve the problem. Any ideas on how to get this to work without building an entire new assembly?