One of my clients has tried to add a product attribute called 'Shipping Date' to products earlier today. He has created the attributed, and then assigned into default attributes set. After the he re-indexed everything to realised that category navigation menu has disappeared. He then deleted the added attribute and re-indexed again without any luck. I am now looking into it and I can't find anything wrong. All products are there as I can find those if I search for products. But I can't get the category navigation menus or go to individual products (before you ask, all products have been set up to show both in catalog and search).
Any suggestions?