Quick demonstration: https://www.youtube.com/watch?v=02OwPGp_0so Timeline gets messed up when I move more than one clip and one of them has the speed effect If the project is saved and reopened the clip with the effect just vanishes from the timeline. Tested with Kdenlive 17.04 on Ubuntu Gnome 16.04 This problem has happened to me for at least a year, multiple kdenlive versions, even different distributions. The bug is simply consistent.
This is a known issue and will be fixed once the timeline refactoring in finished. *** This bug has been marked as a duplicate of bug 369585 ***