Lexi: those settings were all previously available but rather hidden. As for the error, looks like the validating servlet times out waiting to access something. Could have been your stylesheet I suppose. Probably temporary anyway.
The validator chokes on the particular page I tried every time with the same error.
I tried that page on purpose... It's an eCommerce site using (shopping cart) software which runs a mix of ASP/Net, MS-SQL, HTML, JS and CSS. I was testing to see if the validator could navigate such a code mash-up.
In-fact, every page I've attempted to validate at every site using this particular software throws the same error....
Servlet has thrown exception:javax.servlet.ServletException: Timed out
It's one of those situations where the vendor will not do anything to resolve the problem and has more or less told me, "It's simple: don't try to validate our code you'll never know the difference"...
At least I can run the HTML validator on their code --- and after seeing an average of 75 errors per page, I have to assume the CSS is no better or worse.
Have you tried validating the css by direct input or file upload?
On a side note, I like the updated look of the validator. The warnings for no background-color with color are clearer now. There are just sometimes that background color can't be used without looking very wrong.