I just logged in using Firefox now. But I can't see the text I'm typing (it was the same for the login screen). I am not responsible for any typos in this post! I believe the admins made a style change somehwere very recently which affected this. Please change it back!
There were some changes to the CSS this past week. I just logged in with FireFox and I am typing white characters on a black background, so I suspect whatever was out of whack has been whacked back into order before I saw this.
One of the most common issues we have when we make CSS changes is browser caching - the browser showing a cached version of old css instead of the new. So if you are still getting white on white, try dumping your browser cache.