Magento catalog disappear after reindex [closed]

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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?

Answer 1

OK this is what I did. After I took Sylvain's advice about enabling the default theme, it was apparent that this was something to do with a corrupted XML file. Luckily I had a back up from a week ago, so I replaced all theme xml files with that back up. Flushed cache and now we are back in business. Thank you so much for all the tips guys. You all are making this world a bearable place to live :-)