Saffers - I have had the problem for about 7 months on and off. I have decided to go back to my original trainers, leave the orthotics for now (as they aren't helping so far) and see how it goes. I did purchase a stability trainer, tried them once, and hated them. They were like two bricks, and the heel was quite a bit more chunky too - overall a very clumpy, uncomfortable run which seemed like much harder work. My original trainers are pretty basic, not flat by any means, but certainly flatter than any others I have tried.
