Folder deletion - no content, but deletion not possible
As part of a tidy up, I've deleted all the various files and views and folders under 'Tutorial'. I've been able to delete all the Tutorial folders except one (Athletes), which alhtough says it has 'No Content' can't be deleted. It says it is being used by a Storyboard. If I go to the Admin Console and try to delete it there, it says there are 15 reports and 1 storyboard using it, but I can't see any of them (I am administrator).
Any suggestions? There's no 'Storyboard Management' like there is 'Dashboard Management'.