I've been using such things as the following:

a {
 display: block;
}

to change the a tag from inline to block. The validator
started erroring on that line recently. It's been a year
I've used the validator, which used to validate my CSS
file just fine in the past.

Also, I've been looking for a way to validate the referer
page, and I think I'm just missing it somewhere on your
site. I can't seem to find it.

The CSS page that I'm currently using is located at:

http://www.microcosmotalk.com/css/style4.css

The page that is erroring is located at:

http://www.microcosmotalk.com/sample/massage/default.asp

The page errored on July 4th, 2004 while I just tried it
today (July 5th, 2004) and it validates once again.

Oh well, it looks like it's fixed and I found the link.

Maybe I was trying to check it under CSS 3 or some such.

It fails to check properly under CSS 3.