Thanks Daniel...
I think I've found the problem...I went into my Custom Function 1: Exposure Level Increments and changed the setting from 1/2 stop to 1/3 stop. That meant I could set my T2i shutter to 1/50 which in ML world was 1/48! It seems when the camera is powered down then up again the shutter is set by the Canon firmware to the closest increment it can to the previous ML setting. At least I think that's the theory!
I think I've found the problem...I went into my Custom Function 1: Exposure Level Increments and changed the setting from 1/2 stop to 1/3 stop. That meant I could set my T2i shutter to 1/50 which in ML world was 1/48! It seems when the camera is powered down then up again the shutter is set by the Canon firmware to the closest increment it can to the previous ML setting. At least I think that's the theory!