Using latest Chrome Version 27.0.1453.93 and Confluence 5.1 hosted locally we have an issue when you edit a page it appears that Chrome seems to think the edit window should only be about 200px tall. It doesn't stretch all the way to the bottom of the screen. You have to scroll inside that little view and edit your page in there. It's really annoying. Only happens in Chrome. They must have changed how they handle some DOM rendering perhaps?