Posting in the Magento forums has been disabled pending the implementation of a new and improved forum solution which should better serve the community.
For new questions please post at magento.stackexchange.com, the community-run support site for the Magento community. We will be providing updates on the new forum solution soon. For questions or concerns please email firstname.lastname@example.org.
What’s the difference between turning a theme on via “System > Design” vs “Configuration > Design”?
When you set it in Configuration, that’s the default that will be on all the time. When you set it in System, that one will only be turned on during the time period you set. At least that’s how I think it works. I haven’t tried.