So, here are the step by step instructions on how to do a direct WP-MU 2.6.5. to WP 3.0 upgrade.

1. Make a Database backup
2. Backup of all WordPress files on your server root
3. Download wp 3.0…
4. edit wp-config (wp-config-sample.php)
5. deactivate plugins
6. upload all 3.0 files
7. Run the Upgrade function. do /wp-admin/upgrade.php 8. do /wp-admin you should get redirected to your admin pages
8. Updates and plugins

1. Make a backup of your database
Login to your phpMyAdmin. Depending on the version on your server views could be different. My MySQL version is 4.1.22 and my phpMyAdmin is 2.8.0.1.
After loging in you should see a split window, on the left your database and all the tables, on the right th MySQL functions. Find the “Export” link on this page and click on it (if you have more than one databases, you have to make sure to select the one running your WP-MU blog).
Select the “SQL” tick button
Select all the tables of your database
In “Structure” select:
Structure
Add DROP TABLE / VIEW / PROCEDURE / FUNCTION
Add IN NOT EXISTS
Add AUTO_INCREMENT value
Enclose table and field names with backquotes

do not select:
Add CREATE PROCEDURE / FUNCTION
and do not select:
Add into comments
Creation/Update/Check dates

In Data select:
Data
verify Maximal lenght of created query is 50000
and Export type is insert

On the bottom in “Save as file” select:
Save as file
Remember template
compression = zipped

Hit the “Go” button. You will get prompted to select a location where to save the file to.
That is all, your done backing up your complete WordPress MU Database.

2. Backup of all WordPress files on your server root
To make a backup copy of your WordPress files on the server you will have to use an FTP program like ACE FTP freeware. Login to your account and select all the WordPress folders and files. Select all files if you are not using your server for anything other than the WordPress MU installation.
Now right click on the selected files and select “Download”. This will take some time, so be pacient.

3. Download wp 3.0…
Go to the WordPress dot Org site to download the new WordPress 3.0. Unzip all the files.

4. edit wp-config (wp-config-sample.php)
You will have to edit the wp-config.php file to make the installation work properly with your previous settings. A few things will look different in the new wp-config file, but if you follow the instructions, things should work just fine.
A good help to do the editing is a html editor like ACE html. In the editor, open your old wp-config.php file, from your security copy backup, now open the wp-config-sample.php file in the uncompressed WordPress 3.0 folder.
Here is what the wp-config.php looks like:
—————————————————————————————
/* Don’t try to create this file by hand. Read the README.txt and run the installer. */
// ** MySQL settings ** //
define(‘DB_NAME’, ‘your db name’); // The name of the database
define(‘DB_USER’, ‘your db username’); // Your MySQL username
define(‘DB_PASSWORD’, ‘your password’); // …and password
define(‘DB_HOST’, ‘localhost’); // 99% chance you won’t need to change this value
define(‘DB_CHARSET’, ‘utf8′);
define(‘DB_COLLATE’, ”);
define(‘VHOST’, ‘yes’);
$base = ‘/’;

// Change each KEY to a different unique phrase. You won’t have to remember the phrases later,
// so make them long and complicated. You can visit http://api.wordpress.org/secret-key/1.1/
// to get keys generated for you, or just make something up. Each key should have a different phrase.
define(‘AUTH_KEY’, ‘your key’); // Change this to a unique phrase.
define(‘SECURE_AUTH_KEY’, ‘your key’); // Change this to a unique phrase.
define(‘SECURE_AUTH_SALT’, ‘your key’); // Change this to a unique phrase.
define(‘LOGGED_IN_KEY’, ‘your key’); // Change this to a unique phrase.
define(‘SECRET_KEY’, ‘your key’); // Change these to unique phrases.
define(‘SECRET_SALT’, ‘your key’);
define(‘LOGGED_IN_SALT’, ‘your key’);

// double check $base
—————————————————————————————
Now here is the wp-config-sample.php file
—————————————————————————————
define(‘DB_NAME’, ‘copy the original name here’);

/** MySQL database username */
define(‘DB_USER’, ‘copy the original username here’);

/** MySQL database password */
define(‘DB_PASSWORD’, ‘copy the password here’);

/** MySQL hostname */
define(‘DB_HOST’, ‘localhost’);

/** Database Charset to use in creating database tables. */
define(‘DB_CHARSET’, ‘utf8′);

/** The Database Collate type. Don’t change this if in doubt. */
define(‘DB_COLLATE’, ”);
define(‘VHOST’, ‘yes’);

/**#@+
* Authentication Unique Keys and Salts.
*
* Change these to different unique phrases!
* You can generate these using the {@link https://api.wordpress.org/secret-key/1.1/salt/ WordPress.org secret-key service}
* You can change these at any point in time to invalidate all existing cookies. This will force all users to have to log in again.
*
* @since 2.6.0
*/
define(‘AUTH_KEY’, ‘put your unique phrase here or use the old one, cookies will be keept’);
define(‘SECURE_AUTH_KEY’, ‘put your unique phrase here or use the old one, cookies will be keept’);
define(‘LOGGED_IN_KEY’, ‘put your unique phrase here or use the old one, cookies will be keept’);
define(‘NONCE_KEY’, ‘put your unique phrase here or use the old one, cookies will be keept’);
define(‘AUTH_SALT’, ‘put your unique phrase here or use the old one, cookies will be keept’);
define(‘SECURE_AUTH_SALT’, ‘put your unique phrase here or use the old one, cookies will be keept’);
define(‘LOGGED_IN_SALT’, ‘put your unique phrase here or use the old one, cookies will be keept’);
define(‘NONCE_SALT’, ‘put your unique phrase here or use the old one, cookies will be keept’);

define(‘WP_ALLOW_MULTISITE’, true); add this line (isn’t included in wp-config-sample.php)
—————————————————————————————
That’s it, after updating all the fields correctley, save the file as wp-config.php in the unzip 3.0 folder.

5. deactivate plugins
Go to your WordPress Admin – Plugins page and deactivate all your plugins. This eliminates trouble with incompatibility of some Plugins that haven’t been tested with WordPress 3.0.

6. upload all 3.0 files
Use your FTP program to upload all the new 3.0 files from the unzip folder. When prompted check the overwrite option. This is not suggested by WordPress who suggest to delete all WordPress files from the server, but I choose to try the overwrite option, and it worked perfectly.
Upload will take time, so a have a coffee…

7. Run the Upgrade function
Call the URL http://my domain.com/wp-admin/upgrade.php. Within half a minute or so you’ll get a message that the upgrade has been done successfully.
Call http://my domain.com/wp-admin you should get redirected to your admin pages. Depending if you’ve used your old or new pass phrases, you may have to do a login, use your usual login information to do so.
Once in your admin pages you may get some messages. One of them asks you to delete blog.php. Do so using your ftp program and refresh the wp-admin pages. The message should disappear.

8. Updates and Plugins
There may be an issue with the automatic update of your plugins with Worpress 3.0.
Upon selecting one or more plugins from the “upgrade available” tab and clicking on update, the system gets stuck on “maintenance” mode.
To get out of maintenance mode you will have to use your ftp programm and delete .maintenance file manually (you should find this file on your server root.
If you can’t see the file, enable “show hidden files” in file permissions.
Return to “plugins” “active” and find the plugins that have an upgrade available, then click on the or “upgrade automatically” link. This should work. I’m hoping for a bug fix to come out soon, to resolve this issue and to be able to do bulk plugin upgrading. For now it has to be done manually.

If you run into any problems, please comment on it.
Enjoy WordPress 3.0 and all the new options and functions it has.

A special thanks to Matt Mullenweg for the outstanding job on the best free blog software of the Internet.

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- wp-admin write new post: tags autofill text function doesn’t work
- wp-admin write new post: “Add media:” buttons above text field absent or not working
- wp-admin custom fields at bottom of write new post: none of the custom fields can be “droped down” or reduced
- wp-admin in write new post on sidebar: publishing status open and edit button locked, can’t close “publish post” stamp.
- wp-admin in write new post categories: unable to add new categories, categorie dropdown not working, label “+add new category” absent
- wp-admin in write new post plugin: “all in one seo pack” locked, unable to open
- wp-admin in write new post: “custom fields” open and locked, unable to close
- wp-admin in design – widgets: widget tabs locked into position, unable to move them to reorder them

I guess there may be more issues, but I only tried to resolve the above list. I emptied cache and cookies but this didn’t help. I first couldn’t believe that these problems could be caused by Google Chrome, therefore didn’t try out other browsers. But after a few days of desperate intents to solve the problem I gave up, started the Internet Explorer 7, and everything but the widget reorganizing worked fine.
Then I decided to try Mozilla Firefox, to see if it would solve the issue of the “locked” sidebar widget buttons. It did. All sidebar widget objects can be draged and dropped as supposed to by the functionallity of WordPress.
One weird thing I want to add: Until one month ago I used WordPress 2.7 and all these problems didn’t exist. All this started with my upgrade to WordPress MU!!

I will use Mozilla Firefox for WordPress MU publishing from now on, just to much hazzle with Chrome!!

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1. Exec-PHP
2. Youtube Video
3. Sidebar Widgets
4. Write Post – Custom Fields
5. Google Analytics

1. Exec-PHP
After finishing the WP MU install I started re-activating all my plugins. All of them did re-activate without any error messages. Then, when I returned to the “Write a Post” page, the usual

“Exec-PHP WYSIWYG Conversion Warning. Saving this article will render all contained PHP code permanently unuseful. Even if you are saving this article through the Code editor. You can turn off this warning in your user profile. Ignore this warning in case this article does not contain PHP code. Read the Exec-PHP documentation if you are unsure what to do next.”

Message came up! Doing what the help link says, I returned and found out that the Warning was still active. I googled the issue, and found out that the exec-php plugin will not work on WordPress MU. I found some posts mentioning a way to get around this issue, but they were clearly warning of a Security Issue, leaving WordPress MU vulnerable to hackers!!!
So, for now I’m trying to find a way, a new way to make PHP code work on WordPress MU, and here it is:
ATTENTION: Only use this procedure if you are the only user of WordPress MU, since it is a security risk!!
You will have to download a plugin to be able to execute code withing the < and > brackets, and you will further have to edit you kses.php file in the wp-includes folder. Go to my “Execute PHP code on WordPress MU” post for all details…

2. Youtube Video
I have 365 posts, and at least 40 of them have one or more Youtube Videos integrated into them. This Youtube embedding worked excellent on WordPress, but on WordPress MU it does not. After Googeling around for a while I ran into this excellent Plugin created by eJump. It is called EasyTube and it overruns the Worpress MU protection, thus allowing for Youtube and Google Videos to be shown in WordPress MU.
So, the “Youtube Video” issue is solved!

3. Sidebar Widgets
I’m using the “Adsense Prosense” theme for WordPress. It is a Widget ready theme that has 3 Adsense ads integrated, 3 columns, 2 Sidebars. It worked fine on WordPress 2.7, but now on WordPress MU it is not behaving correctly. After editing your Sidebar 1, and clicking on “Save Changes”, you would want to edit Sidebar 2. So I went ahead to display Sidebar 2, and started adding the Widgets I would like to be displayed in it, but everytime I add a Widget, the whole screen returns to display Sidebar 1 and with the Widgets added that I wanted on Sidebar 2. Now that is weird!

I found out that I can use Sidebar 1 as I desire, personalized, and just not touch Sidebar 2, which already has the basic fields in it. Nevertheless I’d rather be able to personalize both Sidebars…

4. Write Post – Custom Fields
Today when I wanted to enter the -write post- tab it took an eternity to open, some 2 or three minutes. I started looking around on Google and found several possible reasons that could cause this.
The most logic one would be a plugin. Thus I de-activated all my plugins, but the problem persisted.
I tried to open this blogs -write post- tab, and it opend in an acceptable time, thus I knew that it was my main blog who was giving trouble.
I kept on checking and by coincidence saw that inside the “custom fields” tab, there was a lot of information in the different fields. I waited for the loading process to finish and then opened the custom field tab, and there were at least 500 entires, descriptions, title and enclosure.
I started deleting them manually and it took me like 20 minutes or more. Then I reloaded the page and some fields where still there, deleted them and reloaded. Finally all custom fields where empty.
The page still loads slower than on my subdomain blogs, but at least it works again.
I will investigate this further and post the solution here.

5. Google Analytics
If you have used Google Analytics before, you may have been using Google Analytics for WordPress by Joost Devalk at http://yoast.com/wordpress/google-analytics/. Sorry, but it seems that this version of the plugin doesn’t work for WPMU.
I googled to see if there are any Google Analytics for WordPress MU out there and found this one:
Google Analytics Plugin For WordPress MU – Revised – English
It works perfectly. One confusing thing about it is that you can reach a “urchin” field in two different tabs:
1. Site Admin: Google Analytics
2. Settings: Google Analytics
Both windows look different, as far as I understand If you fill out option 1. on your main blog, a side wide analytics will be done, if you choose option 2 only the specific URL will by considered for analytics. I’ll observe and update…

I’m working on these Issues and will add solutions as they come but I would greatly appreciate any feedback from you on this.

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