I created a master page and custom css file to brand the root site of on my SP10 server. I then applied this master page to all subsites. The style is applied properly on all sites except when I click the "All Site Content" link from one of the subsites. In this case, it still uses my master page but fails to apply the CSS.
The master page files links to the CSS with "../..Style Library/My.css" (as inserted by SPD). This normally resolves properly to "domain/Style Library/My.css" but from the "All Site Content" (and possibly other undiscovered pages) it is trying to load "domain/subsite/Style Library/My.css"
How can I fix this?