Hi. After manipulating the timeline effects and the duration of the clip, the project was damaged and kdenlive crash.

I tried to send a bug report to the bug.kde.org, but this site also fell after sending the report... ¯\_(ツ)_/¯

An example of a project that I have turned out. When opening kdenlive crashes: https://www.pastefile.com/FlQTT8

Thanks for reporting. I’ts known. Should be fixed in beta6, coming end of next week.