Comment 1 for bug 1676443

Please report the problem upstream so we can keep track of it. https://phabricator.freedesktop.org/tag/pitivi/

If you want to report bugs you notice, please use the flatpak version to be able to use the latest stable which is 0.98 at the moment, so you don't report problems which have already been fixed. BTW, We are working on releasing 1.0, meaning we focus on bugfixing.
http://developer.pitivi.org/Install_with_flatpak.html