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There's a small group of sedes who think all the Papal Claimants from Pius IX and on were Anti-Popes and this is one of the reasons why.  Some go back even further to the 1700's when The Church tolerated Heliocentrism after they already condemned it before.  Some go back even further to the 1500's when The Church started giving a pass for usury when it was strictly condemned before.  Some go back even further than that to the 1000's and 1100's when Popes started living lavisciously and were simoniacs and some claim they were also astrologers and idolaters. 

It's a mess.  I think the problem stems from people not remembering that Popes can Bind AND Loose and then there's the arguments about whether Ultramontanism is Catholicism or is there only certain matters in which Popes are Infallible or not but then this presents a new set of problems.  It's a very slippery slope and I've talked to all manner of those people and their arguments are solid on the surface but I think we're all missing some important pieces.  

I don't know if this site will allow deep dives like this past John XXIII although I think it would be very real and possibly necessary discussion.

There's a small group of sedes who think all the Papal Claimants from Pius IX and on were Anti-Popes and this is one of the reasons why.  Some go back even further to the 1700's when The Church tolerated Heliocentrism after they already condemned it before.  Some go back even further to the 1500's when The Church started giving a pass for usury when it was strictly condemned before.  Some go back even further than that to the 1000's and 1100's when Popes started living lavisciously and were simoniacs and some claim they were also astrologers and idolaters. 

It's a mess.  I think the problem stems from people not remembering that Popes can Bind AND Loose and then there's the arguments about whether Ultramontanism is Catholicism or is there only certain matters in which Popes are Infallible or not but then this presents a new set of problems.  It's a very slippery slope and I've talked to all manner of those people and their arguments are solid on the surface but I think we're all missing some important pieces. 

I don't know if this site will allow deep dives like this past John XXIII although I think it would be very real and possibly necessary discussion.

Exactly EWPJ, there is so much in the rules of papal Catholicism that it seems they can wiggle out of anything as the history of the U-turn on the defined and declared formal heresy of Galileo demonstrated leading up to Vatican II when a lot of binds were loosed. In other words it seems at times they can bind and then loose what was previously 'binded.'
It is well known that when elected Pius IX was modernist but later became traditional again as josefamenendez said. As for being a Mason, well I would want to see his name in their books before we could say he was for certain. Then again that lot could forge his membership. I consider him one of the good guys in the end

In 1738, a mere twenty-one years after the masonic order first went semi-public in London (1717), Pope Clement XII (1730-1740), condemned Fɾҽҽmαsσɳɾყ in his encyclical letter In Eminenti. This exclusion was extended by Pope Pius IX (1846-1878) in Apostolicae Sedis of October 12, 1869 to include the Carbonari and other secret societies also active in the republican revolution in Italy at the time. In all, the Church has issued twenty bulls warning the faithful against Fɾҽҽmαsσɳɾყ.  The best known of these in 1751, 1814, 1821, 1826, 1829, 1832, 1846, 1865, 1869, 1873 and Pope Leo XIII’s Humanum Genus in 1884. The problem is that while giving the appearance of being Christian to the outside world, in fact has inner cores of ruling initiates who are ultimately about the work of the Devil. This was further emphasised in Pius IX’s letter Scite Profecto of July 1873, wherein he attributed masonry to Satan, for he says it can only be he, the eternal adversary of God, who is responsible for it; founded it, and contrived its development. On Nov. 21, 1873 in ‘Etsi Multa,’ concerning this satanic Fɾҽҽmαsσɳɾყ Pius IX decreed an ipso facto excommunication (canon 2335) for any Catholic who joined or associated with it, reserving absolution to the Holy See alone.