Also, for issue “after login, go into any page, all page content don’t appear except the header (only happen after activate membership plugin)”, I tested using other default theme such as nineteen, the page content appear like normal and the admin topbar appear too.

And I found out that the content of the page disappear is because of the “account” button showing at menu. If I hide the account button, the content shows up, but the topbar still not showing up. However I would like to remain the account button at the menu.

Thank you.