Having a similar problem since today (after updating to WP 3.9).
Not sure if I need to make a new thread. Just created an account, because I wanted to bring it to the attention of the developers.
When trying to edit a widget on an existing page, the widget opens but is ‘grayed out’. It doesn’t appear in a lightbox and I’m unable to click on anything (forced to refresh the page).
Hope you can fix this awesome plugin 🙂 thanks!
