How to duplicate keyframes? How do i duplicate keyframes into the same object? I need this for a cyclic animation. I press Shift+D and move the keyframes in the Dopesheet, but the animation doesn't continue after the original keyframes.

Update : It seems that I'm not able to animate any bone after frame 30. Is this a bug? I use Blender 2.78a

Update : This is my set up :
To copy/paste keyframes you use the highlighted buttons below:



To fix the other issue You need to unpin the animation in the NLA editor as shown below and the animation will be there after frame 30 normally