I had to use “Event ActorCursorBeginOver” in my game so I created a new “PlayerController”, where I did enable “Show Mouse Cursor” and the events. Since that, when I click any mouse button (Right, Left or Middle) in game, my camera and character stop rotating. It seems like “Mouse Input” events are still executing, because “Print String” does as well and yet camera is still not rotating.
Update: It happens when I release the button, not when click on it.