This has happened to people that couldn't load some of the layout files that the guild depends on.

Can you visit: [url=http://netdna.bootstrapcdn.com/bootstrap/3.0.3/css/bootstrap.min.css]?

Also, in Firefox, try clicking Tools -> Web Developer -> Web Console. Once the console is open, refresh the page (f5). Does it list any errors that look relevant? Like a 404 error?