Follow-up Comment #1, bug #7979 (project relax): The issue is that the automatic updating of diffusion tensor data structures in 'self.relax.data.diff' occurs through the 'self.__setattr__()' function. Therefore when MC simulation data is appended, this function is not called to update the structures. The append() function call needs to be caught so that the diffusion tensor objects can be updated. _______________________________________________________ Reply to this item at: <http://gna.org/bugs/?7979> _______________________________________________ Message sent via/by Gna! http://gna.org/