Blender 3D Walk Mode bug (fly mode works, but walk mode almost not working)

Hi. I have blender 2.74. Windows 8. Computer with NVidia Geforce GTX 860M, CUDA 6.0.


Fly 3D Mode for the camera works but walk mode works just partially - just a few mouse movement are available, but no hotkeys. For example right and left and also teleport works. But combination of keys W or S for moving forward backward, or A,D or Q,E and many others dont work. I tried to change something in preferences-input, but with no luck.

Ant ideas why?