When switching desktops, the following two lines are displayed by kwin (on STDERR): file:///usr/share/apps/kwin/scripts/desktopchangeosd/contents/ui/main.qml:55:19: QML Item: Binding loop detected for property "width" file:///usr/share/apps/kwin/scripts/desktopchangeosd/contents/ui/main.qml:55:19: QML Item: Binding loop detected for property "height"
no binding loop logged with 5.2. If it still happens please reopen.