Can't access children sites after website location was moved

I have two problems that I am running into for which I would appreciate if someone can provide some ideas as to what is causing the issues.

First some background info.
Wordpress version: 3.2.1
O/S: CentOS release 5.6
Multi site enabled: yes (using subdirectory sites)

I currently have a website, let’s call it ‘devsite.mydomain.com’ which currently resides at ‘/usr/local/www/html/devsite’ on my server. I want to change the physical location of the site to ‘/usr/local/www/html/mysite’ and the url to ‘mysite.mydomain.com’.

This is what I have done:
1. made backups of the database and the files.
2. export the contents of the devsite database (called devDB in mysql) to a text file using: mysqldump -u dbusername -p’dbpassword’ devDB > devDB.DB.currentdate
3. Copy everything in the file system to the right location: cp -Rp devsite/* mysite/
4. Open the mysql database dump in a text editor and replace any instance of the old FQDN URL (‘devsite.mydomain.com’) with the new one ‘mysite.mydomain.com’.
5. Open the mysql database dump in a text editor and replace any instance of the old file system path ‘/usr/local/www/html/devsite’ with the new one ‘/usr/local/www/html/mysite’.
6. change the wp-config.php file so that the line that reads “define(‘DB_NAME’, ‘devDB’)” is changed to “define(‘DB_NAME’, ‘myDB’)”
7. change the wp-config.php file so that the line that reads “define( ‘DOMAIN_CURRENT_SITE’, ‘devsite.mydomain.com’ )” is changed to “define( ‘DOMAIN_CURRENT_SITE’, ‘mysite.mydomain.com’ )”
8. Import the changed mySQL dump file to the new db: mysql -u dbusername -p’dbpassword’ myDB < devDB.DB.currentdate

This is my first problem. The following is what happens:
– I am able to load the main site just fine.
– If i try to visit any of the sub sites, I get a 404 error
– I log in to the network admin dashboard for the main site and if I go to the ‘All sites’ area I can see all the sites are listed. If I click any of them I can see all of that site’s information. I tried updating each site but still no dice. If I click on the dashboard link for each of those sites I still get the 404 ‘website not found’ error.

This is what I have done without any results:
– Restarted httpd
– checked all file system permissions to make sure they matched the original location.
– checked all db permissions
– repeated the process twice.

This is my second problem:
On the ‘devsite’ I have the first user created (id of 1 on the DB) called ‘devsiteadmin’. I would like to change this to be called ‘mysiteadmin’. On the instructions I wrote above of what I did to migrate the site. I have an extra step in between #4 and #5. Let’s call it step 4.5. What I do is I open the mysql database dump in a text editor and replace any instance of ‘devsiteadmin’ with ‘mysiteadmin’. there are only 5 locations where this is changes, 3 of them are in the wp_users table, one in the wp_sitemeta table and one more in the wp_usermeta tables. After doing this I follow the rest of the instructions as mentioned above.

However, this is what happens:
– I still have the same issues as in the problem #1: I’m able to access the main site but can’t access children websites and get the 404 error not found
– When I log in to the dashboard for the main site, I can no longer get to the ‘network admin’ site. The option does not appear in the menu on the top right under my name any more. If I try to force it by typing in: ‘https://mysite.mydomain.com/wp-admin/network/&#8217; I get a blank screen with a message that says: “You do not have sufficient permissions to access this page.”

Any ideas anyone?
Thanks.