iWeb colored text box problem

Hi all,
If I add a filled in colored text box to an iWeb site, it doesn't show up in Safari (v4.0.5) but all is well in Firefox and Camino.
Anyone know of any reason why this might be.
Seems odd, as they are both Apple products!

Thanks

Didn't empty the cache.
But I have now solved it by restarting Safari, which I guess might empty the cache.

Thanks anyway.

My point really was from the perspective of viewing a web page.
If my web page is important to my business, it's a pity that Safari doesn't seem to be quite so accurate in portraying my web site as Firefox. Especially as I was trying to view an Apple iWeb designed site with an Apple browser.