Hey Wouter!
Thanks for the reply. I tried the first fix just now but it still won't allow exposure times below 0.001.

The "sometimes" is one out of two or something? I think both the rotation and the saving problems are often with calibration images taken the next day after I had shut down the pi and the camera for the night, but it's hard to be 100% sure since I've been seeing these problems on and off for the past few months and there are big gaps between imaging sessions.

Rotating the images works for PI but is a hassle. Meanwhile, I've found a setting that may help: Under "capturesettings" of the camera in the INDI control panel there's an option "picturestyle" which was set to "standard" and I now set to Landscape. This sounds like it could fix the rotation problem at least.
I also found an option in the camera settings that might be the key to the saving issue: Under "settings" there's a setting "capturetarget" that has options "Internal RAM" and "Memory Card". It was not set at all, I now changed it to "Memory Card", let's see what happens.

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