Marge was brought a fish in the middle of the morning, and she didn't get up and take it. She just sat on the eggs, nagging a bit. (Hom)Eric stayed on the edge of the nest with the fish and eventually started eating it himself. He must have been there for about 15 mins before he flew off - I didn't see whether he flew off with the remains of the fish, or whether he had already finished it! That definitely isn't normal behaviour for Marge!
As it is raining up there, maybe we have a chick, or it's in the process of hatching? Marge is maybe trying to keep it warm and dry, as when ever I've been watching she is staying on the eggs, occasionally having a rummage, but even when the camera is on the eggs, it is too difficult to see, especially as there's a big bit of lichen sticking up just in the wrong place.