Business Pro – can’t edit page layout

Hi

I have had Business Pro 4 installed for several years with very few problems. Since about two weeks ago the layout (drag and drop etc) option within the pages editor is broken. Eg.. I can’t remove the sidebar for a new page, or alter layout, drag/drop for existing pages. The theme has also changed the widgets at the foot of homepages and other pages though I have managed to change that back using custom html widget.

Thanks