Hello Paul Gallen,
Thank you for contacting us.
Depending on the approach that you have taken to include a theme, one of these Knowledge Base articles should help you: Creating a theme component, Adding custom redistributable themes to your applications.
If you continue experiencing issues, please open a new support ticket and send me a sample project with the theme referenced. This will allow me to further assist you.
Kind regards,
Nikolay
the Telerik team
Check out
Telerik Trainer, the state of the art learning tool for Telerik products.