I noticed that a blog entry of mine had gotten about 5 reputation points the last time I looked now says it has 0. Also, just checked (out of curiosity) and found several posts listed in both my Reputation Given and Received list that say they have 0 (which should mean they wouldn't be on the list at all). It doesn't seem my overall reputation number is declining, only that individual posts are no longer displaying the reputation points, whether given by me or received. Weird.
EDIT: Checked another (random) user's profile and they have several posts in their Reputation lists that show 0 as well.
Edited by poetica, 08 November 2012 - 11:23 AM.