Gray box of Google Reader doom.

I get a strange gray box in Google Reader whenever I am using it. I don't know what is causing it, but sometimes I can highlight the text behind it so I can read and it sometimes it scrolls at a different rate than the rest of the window. It looks like it is caused by Java though I could be way off. I am using Firefox 2.0.0.12 on OS X 10.5.2. I took a screenshot of it to show what it looks like and I am wondering if anyone else has run into something similar.

http://www.flickr.com/photos/merlik/2...

Thanks for your help.