Pope Pius XII, in Humani generis, warned that the new theologians taught modernism in a secretive way, "although they express themselves with prudence in their printed works, they nevertheless speak much more openly in their notes which they hand out in private..." (Humani Generis) This is why they are dangerous. They insinuate themselves carefully among the orthodox, but privately are extremely destructive. Pius XII thought this of DeLubac and he was therefore censured.
And Pius X said this about modernists in general: "They go their way, reprimands and condemnations notwithstanding, masking an incredible audacity under a mock semblance of humility. While they make a pretense of bowing their heads, their minds and hearts are more boldly intent than ever on carrying out their purposes - and this policy they follow willingly and wittingly, both because it is part of their system that authority is to be stimulated but not dethroned, and because it is necessary for them to remain within the ranks of the Church in order that they may gradually transform the collective conscience" (Pascendi)
http://home.comcast.net/~icuweb/c01601.htmFr. Henri de Lubac, S.J. made it his life mission to resolve this problem. In 1950, he published a famous book called Surnaturel in which he criticized the traditional solution of Cardinal Cajetan. He believed that this separated nature from grace too much. For his criticism, he himself was much criticized and even silenced by the Congregation of the Doctrine of the Faith from writing on this question. Pius XII wrote an encyclical called Humani Generis in which he maintained that, "Others destroy the true 'gratuity' of the supernatural order, since they think that God cannot produce beings endowed with intellect without ordering and calling them to the beatific vision." Some thought that this was ordered against the opinion of Fr. DeLubac, but this was not the case. Pius XII removed the prohibition on Fr. DeLubac and he reprinted a revised edition of his book in two volumes. These were published in English as: Augustinianism and Modern Theology and The Mystery of the Supernatural.
The author (Fr. Brian Mullady, O.P.) goes on to criticize de Lubac, so I think his report that "Pius XII removed the prohibition on Fr. DeLubac" can be taken as reliable. It would seem, then, that he was censured by the Holy Office and then exonerated by Pius XII.