ALERT: the wallet address associated with my account recently changed without my input, and now my confirmed rewards are 0. (Previously they were 0.04 btc). Not a huge amount of coin, but still...
Here is the offending wallet address: 14WosrXn3jMZ5frLbxgs4URCRvvfLYQBMq. I just changed it back to my real address, and I've updated my password, too.
(I guess someone finally cracked my Mt Gox password. I thought it was relatively secure, but perhaps not. Boo!)