There are a couple of feeds that I subscribe to that don’t update reliably.
Evil Inc http://www.evil-comic.com/index.xml and Real Life http://www.reallifecomics.com/index.xml both don’t display the feed correctly - they are out of order with items missing.
Looking at the feeds with Firefox shows the feed correctly, and a quick look at the raw feed in a text editor it looks OK (although I haven’t validated it fully).
Not a major problem for me, as I remember to read my daily funnies when I read the others. But is there an issue with the parser/new items checker that may be effecting other feeds?