Yesterday, the top menu of our learning center suddenly doesn’t work anymore. If you click it, it leads you to no where. When we create new menu by ‘Appearance-> Menu’, we got (pending) or NO URL when create menu to link, what can be wrong? We searched all the forums to possible answers, tried to disable plugins, and nothing works!

The puzzle actually is in a database named wp_postsmeta. We found that the database was corrupted, by repairing it, we fix the issue!