Straight from the Moderately Evil Overlord: "We have a known issue with melee combat, where in some situations attacking while moving results in an increased miss rate. This is a bug, and we will take down the servers on Friday to fix it. I apologize very much for any annoyance this is causing."

I add my own apology to that, guys. The Friday downtime is scheduled for 8:00 AM to 1:00 PM, but as always... watch this space for more information. Warning: The whole community team will be coming home from the party in Ohio on Friday morning, so if the servers come back early, it may not be posted with our usual speed.