I have two almost identical feeds running through FeedBurner with FeedDigest PHP scripts pointing to both of them. They have both worked fine for two years. However, one of them is no longer updating. The problem script is with http://app.feeddigest.com/digest3/KXHCTSBJLH.html . The destination page that is not updating can be seen at http://www.usernomics.com/index.html (in the left side scroll box).
The similar one that is working fine is at http://app.feeddigest.com/digest3/HZ5FYFYS9U.html .
Can you see what might be wrong with the problem script?