Hiya broxi. I have a very similar story to you, lost 2.5 stone about 9 years back, re-started Atkins in February and lost a stone and then the weight loss seemed to stall completely.
I think what happens when people come back to the diet the second time around, what was true for me anyway, is that you kind of think "oh, I know this diet backwards, I know what I need to eat & drink on it and I don't need the book to tell me." And the scales did seem to prove me right for the first couple of months, but when the weight loss stopped and I discovered this place and read Jim's "So you're thinking of starting Atkins" sticky, I went back to the book and then took a good look at what I was actually eating each day. I realised then that my veg portion sizes were bigger than they should be on induction, I was eating too much cheese and having too much booze. I was basically doing the level of the diet which I used for maintenance, *after* my initial weight loss, because that was what I remembered of the diet, the years of maint rather than the initial induction/OWL levels. I went back to basics, weighed everything out for a week or so, and the weight loss did re-start eventually.
That's one of the great things about this place, keeping a daily record of what you eat and finding out what stalls other people can really help you pinpoint where you're going wrong. But if you're truly doing it "by the book", it *will* work. The book has a whole chapter on moving into OWL and finding your own personal CCLL (Critical Carbohydrate Level for Losing), have a read of it and see if it sheds any light on things.