Update to the latest version (git pull), restarted it...
Still the same!
I have set an option "--fee 5.0", will it affect my current payout?
2012-03-25 21:12:28.718609 Local: 3538MH/s in last 10.0 minutes Local dead on arrival: ~1.4% (0-3%) Expected time to share: 14.6 minutes
2012-03-25 21:12:28.718762 Shares: 6 (0 orphan, 0 dead) Stale rate: ~0.0% (0-35%) Efficiency: ~108.1% (70-109%) Current payout: 0.0453 BTC
2012-03-25 21:12:28.718837 Pool: 347GH/s Stale rate: 7.5% Expected time to block: 5.1 hours

had a similar issue, after updating and restarting everything works well again.
Should I restart my p2pool? my version is 0.10.3