Sadika Sumanapala wrote: > Hi, > > I have QtCreator installed on my system. When I switch to designer mode > (by > opening *.ui.qml file) some of the window areas goes black, application > start to response slowly and the crashes. > > This happens on both Nouveau & NVIDIA drives (If this matter). > > Does anyone knows to solve this problem? Could be related to https://bugs.archlinux.org/task/44083 Can you try downgrading to Qt 5.4.0?