Recently, John Sanidopoulos's website Mystagogy featured a 7 part series examining the validity of the so-called Pseudo-Isaac texts that have found their way not only in the Greek language print, but also English. These texts, found to be by another Isaac of the Nestorian Church, have gained support by very prominent English-speaking theologians such as Metropolitans Kallistos Ware and Hilarion Alfayev. It seems that various accusations of apokatastasis directed at these two stem from their apparent acceptance of these Pseudo-Isaac texts as being valid and properly attributed.
I have linked below to each of the 7 parts of the examination by Protopresbyter Fr. John Photopoulos.