Problems with 404, .htaccess, permalinks and WordPress custom posts locally on Snow Leopard

You named the custom post type 'custom_about_post' not 'about'. Rename the archive template to archive-custom_about_post.php or better: rename the post type.

As a rule of thumb: Avoid underscores in post type names. There are/were some issues, especially with templates.

And why do you need a custom post type just for about pages? What’s your goal?

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