Closing as can't reproduce, I exported your .capx for both Windows 8.0 and 8.1 and it worked fine. The index.html has a script tag to load jQuery just before the script tag which handles resizes using jQuery, which means jQuery is always loaded before it's used, and I verified the app starts and runs OK. Your links to Dropbox files do not work because you cannot upload Windows 8 exports, they must be run from within Visual Studio only - you should use the HTML5 export if you want to run them off the web.