Kdenlive crashes when disabling "Fade to black", "Fade from black", "Fade in" and "Fade out" transitions if the transition isn't the top effect in the effects list.
With which refactoring version you have that tested?
I tested this on beta 17
That is 18.08 beta 17... But I've retested just now on 19.04 beta 6 and it still happens with "Fade to black" and "Fade from black". I can't tell if it happens with the "Fade in" and "Fade out" from the effects section in 19.04 beta 6, because those effects don't seem to be registering when I drop them. The "Dissolve" transition is unaffected by this issue.
Created attachment 116904 [details] AppImage_13-Dec-18, effect stack Effect stack see attachment. Tried with the nightly build AppImage 13-Dec 18 (https://binary-factory.kde.org/job/Kdenlive_Nightly_Appimage_Build/) -> I have no crash
Created attachment 116906 [details] Project file used in my tests
You need to click on the "eye" icon of the effect for it to crash. I've just tested on the nightly build AppImage 13-Dec 18, and it's still there.
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Tested on 19.03.70... Clicking on the "eye" icon of the fade effect that is not on the top still crashes.
Confirmed. Step to reproduce: stack "Fade to black", "Fade from black" as in attachment 116904 [details]. Click on the "eye" of the 2nd Fade -> crash. It doesn't matter how to arrange the effects, click on the "eye" of the 2nd Fade -> crash. Tested with „Kdenlive_Nightly_Appimage_Build #34“.
I tested the steps to reproduce the crash with version 20.08.1. No crash anymore. We close this bug. If it still appears in the latest version, please feel free to re-open it and update the affected version number.