Just to pass on to anyone else who may have this problem, the problem is now solved, thanks to Luc of deepskystacker.
I had the 3 x Drizzle checked and this was using up a lot more RAM than normal. To use 3x, you need a faster PC.
I unchecked it and am back to processing and stacking lights normally.
I hope this helps someone.
Thanks Luc.
Baz.
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