Try this and see if it helps: When you see the problem, click REFRESH on your browser to reload the page. It sounds to me like your browser may not have completely reloaded the new styles and it may be trying to use some of the old styles. If you are using FireFox, also try doing a "full reload" by pressing Ctrl+F5.
Sorry about the problem, it is hard to find some of these things because all the various versions of browers work differently!