Very similar to bug 354940. If I edit a video, then save the project and change the video profile (example: from 30 FPS to 60 FPS) the timing in the video is completely wrong. Reproducible: Always Steps to reproduce: * import any video file * Add the video to the timeline, changing the start and end times, splitting the clip in the middle, (normal editing operations) * Change video profile from 30 FPS to 60 FPS or vice versa * Video timings are now wrong Also, sometimes while attempting to re-edit the clips in the project the clips disappear, jump to the wrong location, or become "ghost clips" which exist but cannot be selected.
I can confirm the bug, has happened to me since always. Perhaps the option to switch a project profile should be disabled, right now it's very easy to corrupt a full project just by switching profile.
It seems that this report is related to very old unmaintained version. A lot changed since then, especially the timeline got a complete rewrite and it is likely that this has been fixed. Feel free to reopen this bug or create a new report if this is still happening with the latest version (https://kdenlive.org/en/download/)