I'm having a problem here (and looks like plenty of other people experience the same) with the newest Gantry 4.0 for WordPress.
After upgrading to the newest version of Gantry framework, the theme stopped working properly (clean install & rocketlauncher do not work either).
Front end: Theme shown without any styling, white bg & black text, plugins (e.g. slideshow) also broken. At the top of the page is ">" symbol.
Back end: Theme settings not working. When clicking on e.g. 'Kirigami Theme' nothing is showing (the WP admin bar remains on the left but the right hand side is empty & white). In other words the gantry options are not there!
The problem seems to occurring on hostgator's servers as my local installation (MAMP) worked fine.