It writes to console about it: ........ error: "Expected '#' or '[a-zA-Z]', but got '&'." in QUrl("https://kdenlive.org/data/mltprofilesources.xml") ........ org.kde.knewstuff.core: "Error transferring https://kdenlive.org/data/mltprofilesources.xml - server replied: Not Found" kns error "/etc/xdg/kdenlive_projectprofiles.knsrc" "Loading of providers from file: https://kdenlive.org/data/mltprofilesources.xml failed" qml: message: kdenlive_projectprofiles.knsrc: Loading of providers from file: https://kdenlive.org/data/mltprofilesources.xml failed ........
Then it also a duplicate of bug 395718. All messages has gone, as I removed those .knsrc files. *** This bug has been marked as a duplicate of bug 395718 ***