This is not a problem that I'm having when I view my CMS admin pages. Do you have a screen shot so that we can see the same thing as you. This should give us a better idea of what you are seeing and allow us to try to reproduce the issue the same as you.
I have seen before where having certain content on pages can cause problems with the other pages displaying. When you have tested this out on other machines was it the same CMS setup you were looking at?