https://bugs.kde.org/show_bug.cgi?id=397810
--- Comment #6 from Pozsgay Máté <matthew.li...@gmail.com> --- A quick update. It just came into my mind I have enabled an experimental feature: multiple processing thread. From the symptoms it looks like to me it is some kind of race condition issue, so I set back the processing threads to the default 1, and since then no matter how desperately I'm bashing the timeline, start/stop playback, enable/disable tracks; it just works fine. So it seems it is really some kind of threading issue. BTW, I'm using version 18.08.2 from ppa:kdenlive/kdenlive-stable on Ubuntu Bionic with a kernel 4.18.20-041820-generic. -- You are receiving this mail because: You are watching all bug changes.