Membership plugin activation - blank wp-admin

Fresh WP installation with only some WPMUdev plugins activated.

Membership plugin uploaded via FTP. On plugin activation in WP dashboard, wp-admin is completely blank, suggesting a conflict of Membership plugin.
Tried: removing membership plugin via FTP, dropping tables in PHPMyAdmin, reinstalling (several times).
This problem also occurs with the free Membership plugin available in the WordPress repository.