The thing you need to do is "force reload". That is Ctrl-F5 in IE. CSS files expire every three days, and usually your browser gets a new one properly, but yours did not this time.
Like I said, doesn't always work. If it doesn't, then it's cache clearing time.
one more time...... since this is happening to different ppl , with different domain (ip blocks) the dns server is at fault , from your isp, restarting the computer or releasing and renewing the ip will then pick up the new dns from the server....
The DNS record is held by your ISP. Renewing your IP address won't do anything. It's happening to different people, but I bet they're all using the same browser (IE in my case).