Two of the three subscriptions did not download an episode - I got an error instead. iTunes could not deliver, either. I removed the subscription to those two stories: Somebody Somewhere, Secret Sidewalk.
I am puzzled. I never used to get so many errors. Is this the price I pay for increased readership, or is it server troubles?
I have invoked St. Vidicon to intercede for me and battle Murphy so I can enjoy my simple electronic toys.
ETA: Ah. I see at the Podiobooker blog that this is a known problem - with no known solution. (Better light another candle.)