OS 7, VPN-LAN Management Login Stalls

3 sites were just upgraded to TZ-370s with OS 7. All have site-to-site VPN tunnels running between them. Normally, at these sites, if one were to go across the VPN tunnel to login for management through the LAN interface, the login would go almost instantly. On these units, when attempting a login, the initial credential page loads quickly. If another user is logged in, even the prompt to preempt loads quickly. However, when processing anywhere beyond that, the page stalls showing nothing but a small Sonicwall logo that alternates, green, orange, blue in the center of a white page.

This isn't "as" bad when logging in via https, but it's still an issue. Management via both http and https is enabled, and default ports are being used.

Any ideas?