I think it was last summer, go-around due windshear warning which overrode the autopilot disconnect warning. The pilot flying "forgot" the autopilot had been disconnected, and the headless aircraft wobbled around for a long while, almost stalling.
This sounds about right; does anybody know conclusively whether the predictive windshear warning in the 747 overrides the autopilot audio (and visual) alert, and if so will the autopilot disconnect alert sound later?
A design weakness with opportunity for human error?