nested grid floats

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Hi I try to run floats in 4 nested grid configuration and it's impossible because always run in nested 0 (mather). I change Fgrd to 4, I played with differents configurations in Fgrd, Fcoor, Fx0, Fy0, Ftype... and always the same results, only move the floats if the grid is the initial (0). Can help me? Thanks