Can you enable the WP_DEBUG mode in your setup and see if you get any errors thrown in your PHP?
It does not show PHP errors, both when activating and deactivating the plugin
or do you also have a form that is mapped to the post type?
I have a contact form mapped to publish a Post, that is, the type “post”.
When I activated the plugin for the first time I did not notice if I could access the Post menu.
