When using Powerpoint, every time I drag an item on the edit window or try to add a connector the editable area of the screen goes black making it almost impossible to find where you want to move things to or what you want to put a connector on.
With connectors, the screen goes black after I click on a connector and move to the edit area.
With moving shapes, when you click and start to drag, as soon as you start dragging, it goes black.