(Other than struggling with autofocus parameters) a good night with my monochrome Nikon D5100 and SGP. Ran a sequence overnight and woke to a parked mount at good sub frames.
I disconnected all equipment and then remembered that I needed darks and flats and tried to reconnect the cammera, no joy.
Stopped and started SGP and it did connect. Seems like there is some problem in connecting to NIKONs consistently.
Logs:
https://drive.google.com/file/d/0B-ajT8x5IBeGa1NTMlZWT1dzam8/view?usp=sharing