I have a white blank area when I use with Twentyeleven Theme. What is happening is the text is white on a white background, therefore it looks like nothing is there. I can highlight it with the cursor and it appears. Also all of my icons above the edit area disappear. It seemed to happen upon install of either Google XML sitemap or SEO Yoast. It was working until then. I am not using easy rotator plugin.
I'm just deleting CKEditor because it caused me to waste a whole day messing around with it. But please email me when it is fixed