I have multiple custom post types, but one gives an Internal Server Error (HTTP Error 500) when attempting to view all posts from the left menu. The only way I can view posts for this custom post type is to manually add "orderby=" in the URL, which allows me to access posts. For example:
Does NOT work - /wp-admin/edit.php?post_type=news
Does work - /wp-admin/edit.php?post_type=news&orderby=date
All other post types work fine, and so far I have not been able to fix by disabling plugins.