Talks aimed at reconciling a leading advocate of Church reform with Rome were scheduled to be held in Dublin last week.
Fr Tony Flannery, who had been banned from ministry by the Congregation for the Doctrine of the Faith, was due to meet senior members of the Redemptorist order to which he belongs.
Fr Sean McDonagh of the Association of Catholic Priests, founded by Fr Flannery, was also due to attend the talks.
Fr Flannery was ordered to step down from public ministry by the Vatican in 2012.
This came after publication of his views questioning Church teaching on contraception and the theology of priesthood.
Meanwhile, Fr Flannery is organising a major international gathering of Church reform leaders to be held in Ireland, probably in April.