You are not alone. I thought this was a transient issue as a re-compile of master fixed it for me, but that was on an older build than what you are using. There have been at least 3 reports of this now, here is the other thread: indilib.org/forum/ccds-dslrs/8206-proble...-asi-ccd-driver.html

Perhaps it was only a reboot of the system that cleared it and something else is going on that sets this bad state.

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