Chrome reports in the console:
[blocked] The page at dl.dropbox.com/u/23551572/C2/Report/bugs/WebFont/index.html ran insecure content from fonts.googleapis.com/css
I think it's due to Dropbox's server setup. We've had other Dropbox-only problems before. It works fine in Chrome hosted on our server.
Edit: oh, it's because Dropbox runs on https (secure), and it is not allowed to access http (non-secure) resources.