I've had the same problem with mirror lock enabled so the exposure starts when the mirror should open and closes when the exposure should start, it means 3s mirror lock + 60s exposure comes out as a 3s image.
It seems SGP doesn't support enabling/disabling the mirror lock feature on the camera?
There is also a problem with the mode dial with higher end Canon cameras.
The mode dial can be changed electronically so it doesn't matter which mode the dial on the camera is set to.