I've been messing around with PixInsight, loving it... even the very steep learning curve. I just had some issues with DSS that I had never seen before, at one stage the stacked result was just a white screen.
Although when I had those issues I was in hospital on my laptop (5yo laptop) and now I'm stacking on my high end desktop. So perhaps it was a combination of inadequate 32bit computer and my pain-killer haze
Thank you for your help though, it is much appreciated.