I am trying to use the new DEM explicit messaging instruction in RSLogix 500. I am using V7.10 software and the SLC L552 is flashed to OS501 Series C FRN 10 and later. However once I have entered a rung with the DEM instruction the RSLogix screen updating slows terribly. A cross reference takes minutes. I have tried it on a few different PLC's with the same result. Can anyone offer any suggestions as to what I am doing wrong?