Categories and tags have vanished

The problem ended up being that system alerts had caused certain functions to shut down. One of the MySQL functions turned off affected my categories and tags. Bringing the system to a full stop, then restarting set things straight.

- Restarting the database sometimes fixes it

Solutions 2:
The /tmp folder on the server is filled up. When that's the case, the categories dissapear in wordpress. If you have root access to the server, then type:

df -h

This will give you the status of free space on your partitions. Make sure that /tmp isn't 100% used by deleting the files inside it. try these commands to empty the /tmp

rm -rf /tmp/* 1> /dev/null 2>&1

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