I encountered the same issue with my WooCoomerce pages. I am creating a custom theme from scratch. I installed WooCommerce and add the theme support function for it in my functions.php. The pages and shortcodes have been set automatically and I checked them they are ok. But somehow, my cart page is blank (even WordPress menu isn't showing). I enabled the debug mode and checked the logs files but nothing is appearing. It's like a dead end ^^' Dou you guys find a solution for this issue ?