The response from the server containing the main page looks similar. SLL handshake, blabla, several client / server HELLOs, getting the main page data. It's encrypted so i can't say if the content it gets is actually the same in both cases.
Then it gets the IP address of si0.twimg.com (containing the images, css etc according to the source code of the page). handshakes, blabla, HELLOs... And then, it gets data from this server for the one working, and not for the other.
That's as far as I got for now...
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