After reading help on this topic, it seems broken to me.

What I did:
houdini-13.0.447-win64-vc11 Windows 7

1. Open houdini, switch to Animate Desktop
2. Set both timeline's and channel editor's end frame to 25 (fps is also 25)
3. Create Sphere, move it to (0,0,-10) and keyframe it on first frame (Ctrl+K)
4. Move it to (0,0,5) and keyframe at frame 10, and (0,5,0) at frame 5.
So I have 3 keyframes at 1,5,10 and some arc motion in translation.

5. Rightclick on Flipbook button in left viewport menu, Flipbook with New Settings…
6. Check both Scoped Channel Key Frames Only and Enable Block Editing
7. Hit Accept and… nothing

Time cursor goes from frame 1, to 5 then 10. Then MPlay windows appears, some smale window flashed (appeared and disappeared) in right bottom corner (probably console) and MPlay dissapears instantly.

Did I something wrong or is it bug?

So then:
8. Rightclick on Flipbook button in left viewport menu, Flipbook with New Settings… again
9. Check also Append Frames To Current Flipbook
10. Hit Accept and I have MPlay with one frame (and one keyframe - the first one) - ok something at least but I expected more frames.

11. So I hit Remove Frame in MPlay, and click (LMB) Flipbook button in viewport. I got MPlay with only first frame again.
12. So I clicked (LMB) Flipbook button in viewport again. Now I finally got MPlay with three keyframes. (But they are on frames 1, 2 and 3 - I expected them to be on frames 1, 5 and 10)

But I got somewhere.

13. In MPlay I set end frame to 25 and I move second and third keyframe to different frames (3rd to 24, 2nd to 12)

14. In MPlay I hit Anim/Export Blocking and.. nothing.

15. I moved first keyframe to frame 3, 2nd keyframe to 14, 3rd keyframe to 20 and hit Export Blocking again.
In Houdini, only first keyframe changed position to frame 3. Rest of them stayed same as they were on beginning (frame 5, 10)

What I did worng? Could you please show me correct workflow?

Regards,