So many questions... I hope you have time to answer them all for the sake of the quick and the dead here...

1. New frame? Did you already order a whole one? Not only the rear triangle?

2. By going in the previous posts, you were using a Dahon Vitesse seat post that is apparently smaller...?

3. Did that seat post fail as well, or just the frame?

4.What is you weight?

That will do for now.