I had created a project, using the AppImage Kdenlive-17.12.0d-x86_64. At one position in the project, I have used a composite transition with wipe "symmetric_clock.pgm". This worked fine, incl. rendering. However, when I open the project, I get this "Clip error": Luma File: /tmp/.mount_AWD1kz/usr/share/kdelnlive/lumas/HD/symmetric_clock.pgm I can only open the project after removing the clip. The wipe method of the transition than changes to "none". If i then save the project, close kdenlive, start a new instance from the AppImage, and load the project, a new temporary mount path is reported where the pgm file is not found. I could, of course, create a copy of the pgm file into my project folder an use that one. However, it was easier, if kdenlive stored a path relative to the own folder.
Thanks for your report. It should be fixed in git, I will upload a new AppImage in 1-2 days so you can test.
18.04 RC AppImage has just been uploaded here: https://files.kde.org/kdenlive/unstable/kdenlive-18.04-rc.AppImage.mirrorlist Could you test and confirm that the issue is fixed ? Thanks
If you can provide the information requested in comment #2, please add it.
No response; let's assume it is fixed. If you still see this issue, please add a comment, or re-open the bug.