Sorry it took me so long to reply. Lately I've just been trying to clean out my icon folder.
The malfunction looked like my friends page's width was never ending. But when it did end (after much horizontal scrolling) the only post that lasted the entire width was yours. The boxes of textures were in a long horizontal line. I just assumed it was your post that caused it because I've had huge pictures posted on my friends list that have messed up the format before.
I'm not sure what 100% layout width means. But usually I don't have to scroll horizontally at all, does that answer the question?