I'm still seeing lots of the following error messages:

[Mon Aug 26 16:26:45 2013] [error] [client 62.58.4.90] File does not exist: /var/www/vhosts/learn.moodle.net/html/theme/learnmoodle/fonts/OpenSans-Light-webfont.woff) format("woff", referer: http://learn.moodle.net/user/profile.php?id=6632

This tends to indicate that a request to the server is actually containing the ) format("woff" section of the css, which indicates that the url for the woff is not formatted correctly (ie: wrapped in single quotes).

Should be an easy resolution.