Having a bit of a strange bug when using Firefox on OSX... I can't replicate it in Safari. Basically, when scrolling down a "Talk" post... and the bar that contains Print/Favorite This/Email/Share reaches the top of the browser window... that bar scoots to the right and shifts behind some page elements. Scroll down a bit more, and the bar scoots back to normal, but the entire post then shifts further down the page.
If you need any additional info just let me know.