If you just upgraded to WordPress 3.0 and is using the db cache reloaded plugin, you might encounter the following error when you try to access some pages in your admin:
Fatal error: Call to undefined method wpdb::get_blog_prefix() in …/public_html/wp-includes/user.php on line 445
The fix is pretty simple:
- disable the plugin.
- manually delete the wp-content/db.php
- delete the offending plugin
- if you must need to use a caching plugin, I believe there is a patch around (google is your friend). the patch should be good until the plugin developer updates the plugin to be compatible with wordpress 3.0