Last Patch Caused Issues with IP Exemption logging in

[Awye1971]

Sounds like the patch might have changed how session tokens are handled for exempted IPs. When both accounts share the same IP, only one gets validated.
You can try this:

Clear the login cache for both accounts.
Re-create the IP exemption entries manually in the settings.
Restart the server/service after saving the exemption list.
After doing that, both logins should work simultaneously again.