I have been asked to look at a site that was, until a couple of days ago, working absolutely fine. But suddenly the categories have stopped being visible or assignable. The categories still show in the "Recently used" tab when creating a new post, but will not accept the assignment. The categories do not show under "Posts -> Categories" or in the "Available Categories" tab in "Create a new post".
Here are some screenshots of the admin backend for you to see
<img src="http://http://www.incredulous.org/images/uncategorized-posts.png" width="100%" />
<img src="http://http://www.incredulous.org/images/invisible-categories.png" width="100%" />
I have tried the following in an attempt to resolve the issue:
- Turned off all plugins
- Clear /tmp
- Reboot the server
- Repair the DB using both a plugin and using WP_REPAIR, TRUE
- Change the theme
I am not sure now what's left to try, I am a little confused because the permalinks to the categories work, the admin panel shows that the categories exist, trying to re-add the categories results in an error because the categories already exist.
I am absolutely stumped!! If anyone knows the answer to this then please shout, don't feel bad about making me feel stupid, right now, just knowing what the hell is going on will suit me just fine!
Thanks in advance.