Sydney Child Theme incompaitable with new version of wordpress

We updated Wordpress to version 4.6.1 a few days ago while using a sydney child theme and since then we lost the functionality to log in, log out, or make any changes while using the sydney child theme. We are currently using sydney theme (no child) just to log in and try to troubleshoot the issue. Do you have any suggestions of how to get our child theme to work again?

Our site’s url is https://agon.iuserveit.org/wordpress/

Hello there,

So you can’t access your site’s admin area anymore after updating?

Regards,
Kharis

We can still access the admin area. We have degraded down to wordpress 4.6. Our site does not look anything like it did before, though. We have tried deactivating plugins and recopying parts of the hcaccess file. Nothing seems to work. Is there anything you can do remotely?