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Content not appearing after changing Weblog Shortname
After modifying the Weblog's short-name no content appears on the site.
Updating Templates with new Short-name
The short-name is the link between the templates and the weblog being called. When changing the Weblog Short-name that also needs to be updated in the templates. For example:
{exp:weblog:entries weblog="default_site"}
your content
{/exp:channel:entries}
weblog= calls the Weblog Short name. Update that to the new Weblog Short name as entered in the Weblog Preferences.