One client I work with has a bit different interface for some reason than the others. When she is in the widgets menu, it has "edit" link on all the buttons instead of drop downs. When she clicks to "edit" the image widget, a new page opens. The link for "change image" seems to be clickable but the pop-up doesn't appear. This only started since the update from 3.1 to 3.2 (not sure which version of 3.1 it stopped working) or if it was the plugin update itself.
URL is http://www.destinationsholiday.com