Problem(s) Encountered:

From ~1AM, all the data just look like a bias image. We took several test images with dome light on, but didn''t get any signal. We also tried to reopen the shutter and the mirror cover several times, but still no change.     

Solutions:

BNC connector on the electronics box somehow broke in half.  This BNC sends the signal for shutter control.  Once broken, the shutter could not be controlled via the detector GUI, resulting in all images appearing to be biases.  Connector was replaced and system tested.  All appears to be well again.