Has iPlayer developed a theological sense of humour?
Or was there something particularly shocking in the third of William Crawley's weekend documentaries looking at the 500th anniversary of Calvin's birth and the 1859 revival! As usual with iPlayer vagaries, the explanation is usually closer to cock-up than conspiracy.
Note that for the next three weeks this slot - Sunday at 13:30 and the following Thursday at 19:30 - in the Radio Ulster schedule will be filled by Gerry Anderson:
Work! Work! Work! investigates the hidden lives of the Polish community, one of Northern Ireland's biggest ethnic groups.
Update - Monday - The '59 Revival is now available to listen again online until 2pm on Sunday 5 July.