It is true that in the past Freemasonry was condemmed by the Roman Catholic Church but having spoken to my parish priest before I was confirmed (RCIA) I posed this question to him. His reply was that it was Ok and the then Archbishop (now Cardinal Pell) had no theologal problems with it either. From what I have been told his father was a freemason. The only stipulation was that if I was a member of the masonic fraternity on the continent it would not be acceptable. This I believe was due to the heavy political involvement which may underly it. Certainly something which is not tolerated in English speaking lodges throughout the world.
I am also interested as in Melbourne (Australia) there is a very strong Greek lodge, Lodge Gregorious which is made up of predominantly men of Greek origin, and likewise a great proportion of them would belong to the Greek Orthodox Church.