Drupal 6 Core Update Not Updating I am running Drupal 6 and have attempted to update the Core about 5 times recently, and it continues to tell me I haven't updated it. I AM running update.php, and doing it the way it's always worked before. But Drupal is not perceiving that I've done it. 

No problems with individual modules updates. Drupal and following a procedure I've followed numerous times before, successfully. Not using Drush, but am using command line.
Its better to use drush.

Goto your project source folder from terminal.

Use the following command to upgrade.

drush pm-update projects 

Ex: root@karthik$ drush pm-update projects drupal-6.34

This will update your drupal core to 6.4 version.