One more detail that might be important. When I managed to get imaging working earlier today, I also ran into the same problems with the tether+bulb exposures. However, when I disconnected the camera and verifed that the shutter release worked, I restarted kstars right after, and did not restart the camera. Running the capture module worked perfectly first try after this while tethered and using bulb exposures. After the battery swap, I did the exact same sequence of events as I just described, but the issue did not fix itself like last time. I hope this helps in figuring out what exactly is going wrong, and why there is so much inconsistency in the behaviour.

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