Validation Problem

I use Calibre to reconvert my epubs to put in my @font statements in, put in a jacket and change to font sizes.

In the older versions when calibre put the @font statements in all the html files the books validated with flightcrew no problem.

In the newer version I'm getting a "Resorce is reachable..." error for all fonts mentioned. I've checked the manifest and the page_style.css is there. How do I correct this so that my books validate?