There is a bug you can review in PITS
concerning skins being successfully applied. The custom skins in your theme`s folder will not work. To style your theme use the css files in the Global folder, additional css referenced in the master page, or CSS widget. You can use the built in skins
to style widgets without problems.
the Telerik team
Do you want to have your say in the Sitefinity development roadmap? Do you want to know when a feature you requested is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items