[Plugin W3 Total Cache] CDN files work, but hosted files don't.

I love this plug-in, and it’s shaved a couple seconds off my load times.

One question though, that’s got me stumped.

In the minify CSS section of the plug-in, I’ve added the file URIs for my site:

Example: http://www.fakesite.com/wp-content/themes/fake/style.css

When I test it using the “Verify URI” it pulls up fine. But it doesn’t actually work when minified.

What’s strange, though, is that I can list an identical file from the CDN:

Example: http://www.cdn.fakesite.com/wp-content/themes/fake/style.css

And this works fine–both when I verify it and when I enable minification.

Any idea why the CDN version works but the hosted version won’t? Even when the actual file served by both is identical? (For what it’s worth, it’s not just the file names that are identical. The files themselves are identical. But one doesn’t work…)