I was seeing the same behavior with 3.6.7 Stable on Ubuntu. I was indeed using the %C parameter. Initially I thought it had to do with XISF versus FITS: indilib.org/forum/ekos/14088-fits-vs-xis...eduler-progress.html. Did the latest fix make it into 3.6.8 Stable, or do I need to pull latest?

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