Have looked at this some more and wanted to report that if I set up a Bias frame sequence as previously described and select the Start Sequence button, I get the behavior I described (just the spinner and no images captured). If I then select the Stop Sequence button, the sequence stops and the log shows "CCD capture aborted" as one would expect. If I then select the Start Sequence button again, the sequence starts and executes normally. Hope that helps.

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