Upgrading Drupal

Hello Drupal Community!

Two weeks ago I managed to successfully upgrade D7 to D7.2. As far as I knew everything went seamlessly on my testing site and full site. Now, there happens to be a new upgrade (7.4) but I cannot get the 7.2 configuration tab to load. The reason I need the configuration tab to load specifically is to put the site in maintenance mode, so that I can upgrade to D7.4.

So here is the story. I had a rather simple site that was a basic blog and photo gallery here at home. I created the site using O'Reilly's Using Drupal, specifically chapter 7.

I have tried to migrate the site from Drupal 6 to 7 twice. Once as soon as Drupal 7 was released by simply doing the basic remove old code, untar new code, move settings.php and files back in place. Of course this failed miserably so I simply restored my backup.

Hi,
How can I migrate username and passwords from drupal6 to druupal7?

I am not being prompted for a version update in update.php just module updates. I downloaded 6.22 from the website. Do I need to go to 6.16 first. Thanks PS I am also getting this error message everytime I run update.php.user warning: Table 'test.semaphore' doesn't exist query: SELECT expire, value FROM semaphore WHERE name = 'menu_rebuild' in /var/www/html/includes/lock.inc on line 148.
user warning: Table 'test.semaphore' doesn't exist query: SELECT expire, value FROM semaphore WHERE name = 'menu_rebuild' in /var/www/html/includes/lock.inc on line 148.

I have problem after upgrade my drupal 7.2 instalation to drupal 7.4. Problem is my menu not display children links. Has anyone else this problem? Before I do this update I had no problem with that. Even create a menu before his work perfectly, but when I add a new menu with new links children they do not appear.

So Drupal 7.3 allegedly is a security upgrade for Drupal 7.2. But when I ran a diff between the extracted archives from 7.2 and 7.3, I found no code differences. What gives? Is the 7.3 release really a security update, or did the actual security patch get left out, by any chance?