I think this must be some Maya glitch because I add a circular fillet (rounded corner) to my nurbs model but every time I save it and then open it again its gone! Everything else I have done is there all except the circular fillets.

Anyone had this before? It happens every time. I have saved it as a different file and it does exactly the same thing.

I have attached the file. Try adding a circular fillet to the model in the center using the flat surface and the cylindrical surface and then save and open again.