Can't delete templates/page-types
PermalinkIf I search for the old page type it confirms that no page is using the old page type that I'm trying to delete. But when I navigate to "edit" for the old page type and click the "delete page type" it won't delete.
On this note, I am also unable to delete the default page types (full, left sidebar, etc.). I considered manually deleting them from the database but am worried that will kill other parts of the system.
Can anyone help me understand how to delete page types? And the default themes as well?
Thanks so much.

On a side note, I backed up my database and manually deleted the offending page types via phpMyAdmin. That worked like a charm and didn't have any adverse effects on the rest of the system. FYI.
Thanks much for your help. And for the kick-ass CMS.