"What happened?"
They probably read Ephesians for themselves and finally listened to the Holy Spirit rather than the error of 1500 years.
Eph 2:1 And you [hath he quickened], who were dead in trespasses and sins; Wherein in time past ye walked according to the course of this world, according to the prince of the power of the air, the spirit that now worketh in the children of disobedience: Among whom also we all had our conversation in times past in the lusts of our flesh, fulfilling the desires of the flesh and of the mind; and were by nature the children of wrath, even as others.
Eph 2:4 But God, who is rich in mercy, for his great love wherewith he loved us, Even when we were dead in sins, hath quickened us together with Christ, (by grace ye are saved;)
"They probably read Ephesians for themselves and finally listened to the Holy Spirit rather than the error of 1500 years."
They'd have done better to read Ephesians and +John Chrysostomos' Homily IV on Ephesians.
Tell me, bd, was the Holy Spirit "doing a new thing" with the Reformers, like the Episcopalian revisionists claim He is doing now with their theology?