No worries, I’m working on the widget fix. I’ve seen thousands of plugins and yes it happens. Turns out the developers changed a few thing with the new 3.8.1 version and other authors also reported same issues a few days ago.
I have a temporary solution, I will change the search files on your server in a minute.
The widget should work fine now. I also recommend to use the Relevannsi plugin, to enhance the search results more, you can download it here: Relevannsi