[support] Missing Forum categories box

[Skip Taylor]

Hello,

For some reason the categories box shown when creating a forum topic
has disappeared. The forums are there, the list shows under forums and
forum content is there and visible. On other content types the
categories are shown, just not for Forums.

Drupal Version 5.3
Apache version 1.3.39
PHP version 4.4.6
MySQL version 4.1.22

Any idea what to check?