I have an issue where MB Custom Post Types & Custom Taxonomies crashes the post types somehow
When the plugin is active i get the same type of error you would get when there is a post slug conflict
(a white page with text on the left with standard wordpress stuff)
I've tried rollback, but the only way to have the page visible is to deactivate MB Custom Post Types & Custom Taxonomies (preventing the customer from doing anything with the post types)