Ok dont know if im just missing something or im a complete bafoon....I have one 600ex-rt and two 600 exII-rt , now the issue im having is that when the flash is connected to camera , all is well, HSS works like a charm, ETTL all good ...its when i Turn the Flash off ,my camera ( 7D ) goes to max 1/250 , turn on flash..any shutter speed i like ( with HSS that is ) the only way i can get shutter speed back to "normal " ie any speed is by removing the flash....so recap... Flash on camera , turned on all is good... flash on camera, turned OFF ...shutter speed max 1/250.... take flash off camera and all good again... this issue is only with the 600exII-rt not the 600ex-rt....any ideas