Looks like a configuration issue than a theme one. Have to look at error log to see what’s happening. If you see any errors in the error log located in the wordpress install folder, pls send the same to me.
If you want me to take a look, pls reply as a private message here with the site URL and a temporary login to the WordPress dashboard, along with a temporary FTP access to this site so that I can debug this for you. You may also email me the same (see bottom right box in my profile page).