Here's a bit more info from the logs
2017-01-04T10:21:00.287 - DEBG - Guide: "Capturing dark frame..."
2017-01-04T10:21:01.582 - DEBG - fits MIN: 7 - fits MAX: 48 - pixel range: 41 - bin width 0.037037 bin count 1108
2017-01-04T10:21:01.635 - DEBG - FITHistogram: JMIndex 0.829772
2017-01-04T10:21:01.660 - DEBG - Guide: "Dark frame received."
2017-01-04T10:21:01.697 - DEBG - Guide: "Dark frame saved to /home/martin/.local/share/kstars/darks/darkframe_2017-01-04T10:21:01.fits"
2017-01-04T10:21:01.826 - WARN - Audio notification requested, but sound file from notifyrc file was not found, aborting audio notification
2017-01-04T10:22:15.690 - DEBG - Guide: Capturing frame...
2017-01-04T10:22:16.958 - DEBG - Guide: received guide frame.
2017-01-04T10:22:16.959 - DEBG - "Could not open file /home/martin/.local/share/kstars/darks/darkframe_2017-01-03T12:31:43.fits. Error could not open the named file"
2017-01-04T10:22:16.965 - WARN - Audio notification requested, but sound file from notifyrc file was not found, aborting audio notification
2017-01-04T10:22:18.817 - DEBG - Guide: "Capturing dark frame..."
2017-01-04T10:22:20.111 - DEBG - fits MIN: 7 - fits MAX: 45 - pixel range: 38 - bin width 0.034327 bin count 1108
2017-01-04T10:22:20.186 - DEBG - FITHistogram: JMIndex 0.228035
2017-01-04T10:22:20.209 - DEBG - Guide: "Dark frame received."
2017-01-04T10:22:20.246 - DEBG - Guide: "Dark frame saved to /home/martin/.local/share/kstars/darks/darkframe_2017-01-04T10:22:20.fits"
2017-01-04T10:22:20.368 - WARN - Audio notification requested, but sound file from notifyrc file was not found, aborting audio notification
Also seems to be a problem with sound notification