When you view the Site Decorations for a given Space, you get the following exception:

(Note the repetition of "decorators/decorators")

15-Jul-2004 01:42:52 com.atlassian.confluence.spaces.actions.SpaceViewDefaultDecoratorAction readDefaultTemplate
WARNING: Trouble reading velocity template
org.apache.velocity.exception.ResourceNotFoundException: Unable to find resource 'decorators/decorators/components/blogpost.vmd'
at org.apache.velocity.runtime.resource.ResourceManagerImpl.loadResource(ResourceManagerImpl.java:501)
at org.apache.velocity.runtime.resource.ResourceManagerImpl.getResource(ResourceManagerImpl.java:384)
at org.apache.velocity.runtime.RuntimeInstance.getTemplate(RuntimeInstance.java:814)
<snip>

This occurs for all space Decorators; Main, Popup, Printable, Export, Blog, etc