Post/Page Editor Box Issue

I am using 3.2.1 and the twenty eleven theme and have noticed that I cannot type all the way to the right in the editor boxes for pages and posts. The text “returns” early leaving a big chunk of white on the right side of the editor box. This does not affect the posts or pages in how they are published, but it is an annoyance for me when I am writing. Here is a picture of what I am talking about:
https://skitch.com/bunzie/gr9up/add-new-post-marchionda.org-wordpress
Any help would be appreciated, but it is not crucial. Thanks in advance for any support here. 🙂