'''Attempts to do multiple exposures (e.g. for flats) lead to alternating black (empty) frames, something's broken in the GUI!'''
* Abort the exposure and kill the GUI
* Clicking the "reset exposure controls" button on the advanced tab of the Exposure /CCD info pane does not clear the problem, so open a terminal and type "restart_services"
* Restart the GUI and proceed with single exposures
* We'll sort this out ASAP!