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Categories 'module' not showing up

Hi Experts,

I am having issues with my theme. When I add a post, the Categories 'module' is not showing up on the post editing screen. This module I'm referring to is the one that normally shows up on the right side by the Post Tags and Post Thumbnail.

The Categories module was showing up a few weeks ago, but now all of a sudden it no longer shows up.

I am using Flutter for a few custom post types (theme was developed before WP 3.0)

Thanks a lot for your help.