Yesterday GFWA was doing its thing displaying featured posts with different tags for me on the home page of a site using the Adorable theme, and also the Genesis Responsive Slider. This morning I happened to notice that the Force Regenerate Thumbnails plugin needed updating. I've used that a few times because of changing slider image sizes, etc, and not had any problems with its previous incarnations. And I've used GFWA on more sites than I can count now and never had any trouble.
Anyway, whether or not the two are related, I suddenly noticed a serious problem on the home page where the featured widgets were supposed to display. The slider stopped displaying. (Tried turning the slider off. Didn't help.) Halfway down the featured widget areas, the featured widgets stopped displaying, too. No footer. No sidebar. Links below show screenshots of the layout as it's supposed to be (with the default post widgets) and the layout broken.
I checked to see whether I had any unclosed divs in posts, and didn't find any. I checked the actual home.php file to see whether that had gotten corrupted, but that's fine, too. (Also, the fact that the layout fixed itself when I turned off GFWA, but stayed broken when I turned off any and all other plugins, seemed kind of suggestive.) I am Frankly Baffled and rather anxious, as I use this plugin all the time.