Categories pages don’t display posts

Menu is set up with categories, there are thousands of posts with categories assigned to them. When you visit any of the pages, you see the title of the menu & paging below, but no posts.

• This topic was modified 4 years, 8 months ago by Jan Dembowski. Reason: Moved to Fixing WordPress, this is not an Everything else WordPress topic

The page I need help with: [log in to see the link]