Blank page, debug not working

On https://www.pezcollectors.com the search normaly works. If you search for dog you get a blank page with a title of "HTTP 500 Internal Server Error". Clicking the "All products" link always produces the blank page.

I installed the debug mod, and have tried with cache directory permissions of 755 and 777. Going to the pages does not produce a debug log. I also don't have anything related in the server error logs.

I'm fairly sure there is just bad data in one of my producyt (one with dog in the description probably), but I have no idea how to track it down. Any help would be apriciated.

The good news is that I found a product that wouldn't display, disabled it, and now the blank pages are fixed. The catch is that I can't find a single thing wrong with the product. Nothing weird in name, description, or anything. I will try just creating a new product for it and see if that works.