Hello Miguel,
Can you please make sure that there is no User exit active in your system, you can check this in table TBE34 in your ERP system. if there is active user exits, please deactivate these. Also make sure that filters are in synch in your system, this can be checked in transaction R3AC1, click the relevant object.
Finally ensure that the only entries in transaction CRMC_BUT_CALL_FU that are active are the ones contained in note 757955. If there is any active Z function modules, please deactivate them.
Thanks
Willie