In the php/admin.php file is the following section:
$page = add_submenu_page('options-general.php', 'Publish 2 Ping.fm Settings', 'Publish 2 Ping.fm', 9, basename(__FILE__), array(&$this, 'printAdminPage'));
The "basename(__FILE__)" turns into "admin.php". So, this section of code declares that the plugin's admin menu page is located at domain.com/wp-admin/admin.php. Since most generic admin pages are accessed as domain.com/wp-admin/admin.php?page=pagename, this section of code is causing issues with some plugin and theme admin pages. Affected pages simply produce the following error:
You do not have sufficient permissions to access this page.
Changing "basename(__FILE__)" to "publish-2-pingfm" fixes the issue.