Hi - Darktable 2.6.1 recognises my tethered 60d and usually works fine and shows the preview. Occasionally - usually when I really need it like an upcoming photo session with a client - it doesn’t show the preview. It does, however, save the image on the laptop so all is not lost. I am using default settings - nothing has been changed.
Can anyone suggest what is wrong - is there something I’ not doing?
Thanks in advance