Keyframes visible in action editor but not in timeline!

For some reason the keyframes are gone for all my actions from the timeline. I can still edit the actions and they can be played back, but the keyfames are only visible in the action editor!

Please help! What is the issue here?

All of them? I know there is under view - only selected channels, this turns off all but the selected object. i do not know how all is turned off completely.

Thanks! Sorry for the late reply - yes they actualy only disappeared when I deselected all bones in the pose mode!

So thanks - it was indeed the issue and I have no clue how I activated that x]