I do have the most recent updates to WordPress (4.7) and Boldgrids Inspirations (1.3). In fact, prior to the updates, I did not have this problem although it was several months ago that I added my last widget. My steps were to click on Customize/Widgets/Header-Footer Widgets/ and then pick an empty widget area on my page. I then get the “Add a Widget” button which is what normally should happen. But even though the button is there, it is inactive and does not react to my clicking it. If I click on a widget that already has some content, the content is visible and I can open it up, edit it, etc. But I cannot add new content to a new widget. Hope this helps explain my problem.