Once you have completed your design, you should turn caching back on:
<add key="CacheCssOnServer" value="true" />
<add key="CacheCssInBrowser" value="true" />
if caching is turned off sometimes it causes IE 6 not to get the css, I have seen this where it gets no style then refresh the page and it works but in my testing once I turned the caching back on it worked fine in IE 6.
Hope it helps,