I am currently using a control logix plc and am trying to do an online edit. I have done them hundreds of times but for some reason....today it is not working. I am online with the plc I double click the routine and select the rung. When I double click the rung it acts like it is going to allow it but when I try to modify anything in the rung.... it does not happen. Is there something I am missing? PLC is in run mode and running fine.... just need to make a change to one rung.