same problem as well
When I'm about 3000ft I disengage autopilot and later autothrust and I try to perform a manual landing. When I'm close to the runway (more or less 300/400 feet) the Bus suddenly point the nose down and I can't do anything... I crashed.
This happened 4 times in 4 flights in 4 different airports LIPZ - LFMN - LFKJ - LXGB.
Fmc is correctly set and Joystick as well with the indication you wrote in the Step By Step guide.
Speed was good about 145knots, aircraft was quite light 15% fuel...
Is there anything special I have to do?