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This setting is checked by default. This is because the Canonical URLs setting protects you from being punished by Google for duplicate content, or having multiple URLs leading to the same content. Google has a post on their Webmaster Central Blog which details the issues Googlebot faces with indexing duplicate content and how to avoid it. Remember, having this box checked helps you follow Google’s rules.
For more information, refer to this post by Google.
No Pagination for Canonical URLs
This option was added for those users who want to remove the pagination from Canonical URLs. Typically the Canonical URL for a paginated page or post will be displayed at http://mydomain.com/page/2/. This option removes the /page/2/ from the Canonical URL.
Use Original Title
This setting is disabled by default. You may need to enable this if your theme or other active plugins on your site are interfering with All in One SEO Pack writing the Title tags on your site.
Log Important Events
The Log Important Events option generates a log file of events occurring within the All in One SEO Pack plugin. The log file will be located in the wp-content/ directory. This is mainly used for debugging and reporting and can be safely left unchecked unless instructed to check it by our Support Team in our Premium Support Forums.