Y: The Last Man producers Aida Mashaka Croal and Michael Green have taken to Twitter to announce that FX "has decided not to move forward with our series in its current form," though a network insider says that FX has merely parted ways with the producers over creative differences, and that it's still moving forward with the series and the current cast. Confused? So are we. Croal and Green co-produced the pilot, based on Brian K. Vaughn and Pia Guerra's acclaimed comic book series that follows the sole surviving male on Earth after a virus completely hands …