Hi Malcolm,
Did you resolve this in the end? I had exactly the same issue recently (albeit with a QHY5L-II). Reasonable data, lots of align points, very few stack points and a white image to finish.
Tried again with Registax 5 and had no problem at all. Tried Autostakkert as well, and that also gave me a reasonably good final image. It's a pity, because I quite like the Registax 6 interface.
Cheers,
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