I am using X 6.4.6 and Cornerstone 3.4.6, and when I try to add an element into the page it isn’t being placed on the page. I see the icon when dragging over the element, but it never drops into the place. I’ve enclosed a screenshot 
This happens for any element. I can select it, drag it over to the layout, but it just won’t insert anywhere on the page or in any layout areas. Thanks for any assistance.
- Joseph