Shortcodes not working

Hi, I'm trying to setup a multisite, and the register form is not displaying at /register and /wp-signup.php. The shortcodes aren't working -- The header and nav show, but the form is not there.

I have this checked 'Both sites and user accounts can be registered.'

I tried installing and activating 'Membership 2', 'Pro sites', and both together. When I deactivate them, the shortcode text displays on the register page.

I Googled and Googled and found related threads but nothing that solves this for me. . No luck. Ideas?

Thanks,
Mac