Excluded items active again after update

The latest updates (2.3->2.4.2) do not work on my site. All my previous excluded items (which are podcast entries) are unhidden.
Checking the ‘exclude’ checkbox with the item seems to be lost again when saved (as if the new settings cannot be written). I have to revert to v 2.1 to hide the items again.
After 2.3 I hoped that a new update would fix this problem, but it doesn’t.
(BTW site now has v 2.1)

The page I need help with: [log in to see the link]