I've received quite a few notes both in the forums and personally about the menu "bug" some are experiencing (date covering menu). This is a result of web browsers not automatically reloading the stylesheet after changes have been made. SHIFT+reload should take care of it.
If anyone knows some magic code to convince a browser to refresh the CSS automatically, please let me know.
Well, I guess if you rename the css-file and also adjust that in your code, any browser will refresh the css...