I own a Google Apps domain, and I've built a site in Google Sites. Within the site I've embedded some gadgets, added by URL.

The problem occurs when I open the site in Chrome: the gadgets aren't displayed and there's a white space instead of them. This doesn't happen when opening the site in Firefox.

Here's the difference. This is the page as displayed in Firefox:

This is the page from Google Chrome, instead (without the gadgets):

How can I prevent this behavior? I'm aware that the gadgets loaded by an external URL can be seen as non-secure items, but why is Chrome blocking them at all?