I've just installed default versions of WordPress 3.0.1 and Magento 184.108.40.206 locally using MAMP. Both are fully functional.
WP is in the root - localhost.localdomain/wordpress/
Magento is in a subdirectory - localhost.localdomain/wordpress/magento/
I followed the instructions - http://wordpress.org/extend/plugins/mage-enabler/installation/.
On step 4, I can see the Mage Enabler admin page tab after the plugin is activated, but the page itself is empty.
Has anyone else experienced this?