Yes there used to be various problems with the fits viewer but most of these seem to have been either fixed or my switching off sound notifications. I don’t actually see/notice a crash so maybe there’s some intermittent problem. I will turn off auto debayering in the fits setup just in case.

Astroberry is still at 32bit with the update to 64bit being worked on I believe. Silver lining of that cloud is I’m stuck pre-optical train on a reasonably stable build which my constant apt updating cannot mess up

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