Usually, that "ding" it's generated when a running program pops up another window with a message or something like that. So, if you click on the main window, it does not respond and generate that sound. If it's that "ding" then you should probably try to whatch a movie in windowed mode (not full screen) and see if another window pop up.
It may be a subtitle upload/download window (some older versions had such problems) so my advice is also to upgrade to a newer version (yours is 1 year old allready).
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