FSGS sometimes recurs on the operating table before they even close you. This is determined by massive protein leakage in the new kidney.Unfortunately, recurrence after primary FSGS is sufficiently common that the odds are that's what's happening.
Did they dose you with Rituxamab, IVIG and plasmapheresis after the transplant? I had my 2nd transplant on July 19, 2014 and they were extremely aggressive this time around to control my FSGS. First transplant 18 years ago FSGS came back on the operating table and lasted only 1 year. So far no protein and doing very well. They told me they have been having great success with the Rituxamab, even thou they don't know why it seems to work in some FSGS patients. Good luck and keep the faith