hello dear developer hello dear users - good day all!
first of all i have a drupal commons installed - and i do not have any style at http://campus-24.com/ see the of the current status description here:
if you installed a commons and do not have a theme / nor a style just head over and read this: http://commons.acquia.com/discussion/no-theme-new-install and http://commons.acquia.com/discussion/no-theme-new-install#comment-15346
also had the same problem and it was solved by disabling CSS Optimizaition. checked all my CSS under /profiles/drupalcommons/themes, and all are UTF-8. You also might find an answer http://drupal.org/node/445462 You just have to convert all your css files in unix/utf8 and it's done.