Weird result after publishing

Hi, I have just published an updated site to replace my old one. I have checked out the result on both Google Chrome and Firefox with mixed results.

I tried entering just my domain name into the address bar (without the www), as well as prefixing with www.). In Firefox, it comes up as the old website, both times. In Google, it comes up as the old website when I just enter my domain name, and the new website when I use the www. in front of it.

So three out of four, I am getting the old website.

Has anyone else experienced this?

I'm using Web Designer 9 Premium and Windows 7.

Try opening your site and clicking Ctrl + F5. What happens?

Wow, what just happened? It corrected itself.

That is to say... I hit Ctrl + F5 and then it corrected itself. Thanks, it worked a treat. What are members of the public likely to see when they visit the site? Will the changes filter down of their own accord?