I have to keep turning the template on and off to keep it working on the web. There is no way to upload a screen capture here but if you open the URL on an iPhone you will see it is just the directory list.
I am going to have to restore a backup from before the update to correct the issue. Will give you a couple hours to reply with a possible solution before I do that so you can see the problem, but customer is upset.
I can see the problem on the desktop also.
Looks like not all files were uploaded correctly.
We would recommend you to create a staging site (full copy of the production site; to avoid problems on the production site and be able to fix problems without rush), update theme and all the included plugins to latest versions and then check the problem. In case the issue still appears then reply back with access to the staging site (wp-admin and FTP access) and we’ll check it in more details.
If you want we can help you with theme and plugin update, on the staging site.