Created attachment 183916 [details] Kdenlive critical bug A Catastrophic bug happened to me multiple times, but idk why. My theory is that it occurs when I used undo/redo a lot - or when I redo a lot of actions. Basically the issue is that is duplicate multiple clips and move them at right (likely to a position where they have been in the past, like before I moved them). At first you don't see them, everything is invisible. The only cue you have is that the project is way longer that what it should be. But as soon as you reload the project, everything appear and you're screwed. Which implies that you can save your project and continue later just to have the surprise that you're project is messed up. If you lose backup files you're screwed. Look at this screen. My timeline was 50 min long, and because of this bug, it's now more than 2 hours because of those duplicated clips that overlap with each other. https://i.ibb.co/JFSpPnH6/image.png I hope you'll be able to fix it asap. Thank you very much for your efforts.