After adding an item using qlist from web part the Save buttin does not work or you’re redirected to a new dialog
Titleitem is not added by the qlist from web part
Make sure all the files required for QWP exist on server.
Navigate to C:Program FilesCommon FilesMicrosoft SharedWeb Server Extensions and check the following:
If files/folders are not presented, copy them from another server with the same version of QWP.