I added a categories widget in my sidebar but it is empty. I opened post categories in my dashboard and all of my categories are listed there, however each one has a posts count of 0, which would explain why the categories widget is empty.
The same thing happened with my tags; tag cloud is empty, when I open post tags in dashboard, they’re all there, but the posts count for each tags is set to 0.
I’ve since started from scratch and don’t have it up just yet. But, I could look at a post and all of the appropriate tags and categories are listed in the right places – they appear to be associated to the post.
But, when I open post tags in the dashboard, the tags are indeed listed, but at the far right of each one, is a 0, representing the number of posts with that tag. Same is true of the categories listing.
So, even though they show up in the post itself, they don’t appear to be linked to the post in the database. I noticed this when my tag could widget showed 0 tags.