Magento Admin Menu not working after Upgrade

Wondering why your Magento admin menu is not showing up after upgrading your live Magento store?

If all attempts to get to a particular admin page with the exception of the dashboard proved abortive, this could be because there is a conflict between the Magento function that merges all Javascript files and the Apache URL rewrite. This could be fixed by turning off this Magento function, and your can run the script below to do this.

UPDATE  `[your_magento_database_name]`.`core_config_data` SET  `value` =  '0' WHERE  `core_config_data`.`path` =`dev/js/merge_files`;

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