It happened to me, so I really sympathise. Mine started the first time I bought a pair of Brasher boots, the blisters then were dreadful. I then bought a new pair, same make, same model but this time the female version. It worked instantly, no more blisters! At the same time I started to use Sorbothane inserts, much more comfort and easier to walk further and still no more blisters.
The last time I had blisters was when I substituted my 'soft' Sorbothanes for my 'hard' Superfeet inserts. The blisters appeared all around the left heel area and under both feet. The heel problem was caused, I think, by the sharpish edge of the cup that my heel fitted into and I then concluded that the underfeet ones were caused by my feet slightly 'sliding around' on the smooth toe area of those inserts. I went back to Sorbothanes and have not had a blister since.
To be honest though, I have been on 'the verge' of getting a blister now and again. Nowadays I just make sure that at every stop, I take my boots off and wash my feet with a 'Wet One' or similar,. I then let them dry properly and always turn my socks inside out for the next stage of my hike. I may do this two, three, sometimes four times a day!
All I can reliably say is that the method that I use works for me. Feet are such funny things!