The CSS for our website randomly stopped working in IE6, after working fine
for about a year. We didn't make any changes.
The page loads with no styles applied, and when you type the URL
of some of the CSS files, it sometimes shows scrambled characters instead of the actual content of the CSS file. It happens on 3 different computers and the error doesn't occur in FF and IE7

Could you link us to both the website and the CSS file? It might not give the answers but it will be a good basis to start with.

Cheers.

I'll bet you started using compression on the server side.

I didn't change an option to use compression on the server side. How do I disable it though?

Website: http://www.planetminibox.com/home/en-us/index.php

CSS files: http://www.planetminibox.com/css/base.css
http://www.planetminibox.com/css/index.css
http://www.planetminibox.com/css/menus.css

It seems to be working in IE6 now, but it's probably just a matter of time before it gives problems again?