I just noticed something that I think is a difference...
...but I can't try it with old ie to verify. And anyhow, it looks like an artistic flair, so I'm not complaining:
The Thuvia post has text and a pic. The big white box where post's message text is displayed is only as big as the text. The pic hangs over and past the bottom of the white box.
I hope that makes some kind of sense. I'd draw you a picture but I'd never get the formatting right and it would be a mess.