The camera (Canon 5D) will randomly fire (sometimes it will sometime not) the first frame, then rotate, pause, pause, then keep rotating around and around until I stop the program. I plugged the shutter release into the pano-head as the cable that I have does not fit the hand controller.
I encoutered this issue also . . with my 5D2 - the cable was broken inside the jack. Well - not completely broken but the soldering was . . fuzzy(?).
I suggest to connect the camera remote cable to the controller and not to the Merlin. MerlinÂ´s connections sometimes are somewhat funny . .