2.8 Problems and Solutions (FAQ)

Insure backups are completed before doing the upgrade
1. See WordPress Backups

Can’t login to deactivate all plugins
1. Read How to deactivate all plugins when not able to access the administrative menus?

Try these things to resolve problems with Visual Editor and editor tool bar
1. Delete or refresh the browser cache

2. If using Gears, disable it and re-enable it again

3. Delete wp-admin and wp-includes directories and upload fresh copies from a new(important) install package or reinstall automatically

4. Visit https://yoursite.com/wp-includes/js/tinymce/wp-tinymce.php and look for any PHP errors or warnings at the top. If there are any try contacting your hosting provider to resolve them or try the next step. Of course replace yoursite.com with your domain

5. A number of plugins have been reported to present problems so deactivate all plugins and reactivate one-by-one to find culprit. Any plugin that uses its own javascripts might be a possible candidate.

6. Add define( ‘CONCATENATE_SCRIPTS’, false ); near the top of wp-config.php. That would make WordPress admin run slower, so can try removing it in a few days and testing again (this would eliminate any stale network cache)

7. Some people also reported success redoing the upgrade via Tools->Upgrade->Re-install automatically, then clearing the browser cache.

8. Try another browser

9. Confirm that Your Profile, “Disable the visual editor when writing”, is NOT checked.

Try these things to resolve problems with Widgets such as not able to drag and drop
1. A number of plugins have been reported to present problems so deactivate all plugins and reactivate one-by-one to find culprit

2. In Appearance->Widgets under Screen options, try the Enable Accessibility Mode

3. Delete or refresh the browser cache

Fatal error: Allowed memory size of xxxxxxxx bytes exhausted
If deactivating plugins doesn’t work try one of these methods for increasing the amount of memory a PHP script may consume

1. If you have access to your PHP.ini file, change the line in PHP.ini
If your line shows 32M try 64M:
memory_limit = 64M ; Maximum amount of memory a script may consume (64MB)

2. If you don’t have access to PHP.ini try adding this to an .htaccess file:
php_value memory_limit 64M

3. Try adding this line to your wp-config.php file:
Increasing memory allocated to PHP
define('WP_MEMORY_LIMIT', '64M');

4. Talk to your host.

Upgraded, can’t login and getting error message
In a few cases, the error message reports what plugin file is causing the problem so rename or delete the plugin folder, then try login again.

A post is repeatedly displayed on the blog’s main page
Likely a problem caused by a plugin so deactivate all plugins and reactivate one-by-one to determine the culprit.

Getting Warning: gzinflate() [function.gzinflate]: data error when doing the upgrade
1. Try redoing the upgrade via Tools->Upgrade->Re-install automatically
2. If that fails, disable all plugins and perform a manual upgrade (see Upgrading WordPress.

Upgrade causing error 500s
1. Deactivate all plugins and redo upgrade.
2. If necessary, perform a manual upgrade (see Upgrading WordPress.

Blank admin pages after login
1. Deactivate all plugins. See How to deactivate all plugins when not able to access the administrative menus?
2. If necessary, rename theme folder in wp-content/themes to cause WordPress Default theme to be place into service

Blank site after upgrade
1. Deactivate all plugins. See How to deactivate all plugins when not able to access the administrative menus?
2. If necessary, rename your theme folder in wp-content/themes to cause WordPress Default theme to be place into service, then see if there’s an upgrade for your theme

Getting Fatal error: Cannot use object of type WP_Error as array
1. Problem has been reported with the Options and Structure theme so look for upgrades
2. Change to the WordPress Default theme if necessary

Tags are not saved
1. If you using hyperdb, make sure to update it.