Upgrade issues

Yep, did a hard refresh… no go.
Linky is http://leatherkat.org/wordpress
Hopefully I can get it working again soon… *sad Kat*

Ok, I validated my XHTML, and that was ok… but when I went to validate my CSS… this is what I got:
Errors
URI : http://leatherkat.org/wordpress/index.php
* Line: 12
File not foundhttp://leatherkat.org/wp-layout.css: Not Found
URI : http://leatherkat.org/print.css
* Line: -1
File not foundhttp://leatherkat.org/print.css: Not Found
No style sheet found
I’m just wondering if this is the cause of the problem? And if so… how do I fix it? It worked fine before the upgrade…