Unable to use OptimizePress Theme Live Editor After WP4.9 Upgrade

I am unable to use the LiveEditor with the OptimizePress theme after upgrading to version 4.9. I get no errors shown on the web page only the spinning loading image (with a darkened background). Tried from both the link on the page itself and the one within the Admin section.

Checked the logs on the server and no entries with a 500+ are present.

Checked within the Developer Tools of Chrome and there are now obvious issue present (everything appears to load fine (with the exception of a warning about a google font)).

Cleared the cache on the browser, deactivated all plugins.

Webhost is HostGator

Browser is Chrome 62.0.3202.94 – Windows 10

Installed the HealthCheck plugin – see below for the contents of the Debug Page
* The only major failures noted were: The loopback request to your site took too long to complete, this may prevent WP_Cron from working, along with theme and plugin editors.
* Result from testing without any plugins active: The loopback request to your site took too long to complete, this may prevent WP_Cron from working, along with theme and plugin editors.

Debug Page:

### WordPress ###

Version: 4.9
Language: en_GB
Permalink structure: /%year%/%monthnum%/%day%/%postname%/
Is this site using HTTPS?: No
Can anyone register on this site?: No
Default comment status: closed
Is this a multisite?: No
User Count: 1
Communication with www.remarpro.com: www.remarpro.com is reachable
Create loopback requests: The loopback request to your site took too long to complete, this may prevent WP_Cron from working, along with theme and plugin editors.

### Active theme ###

Name: OptimizePress
Version: 2.5.7
Author: OptimizePress
Author website: https://www.optimizepress.com/
Parent theme: Not a child theme
Supported theme features: automatic-feed-links, post-thumbnails, menus, widgets

### Other themes (3) ###

Twenty Fifteen (twentyfifteen): version 1.6 by the WordPress team
Twenty Fourteen (twentyfourteen): version 1.8 by the WordPress team
Twenty Thirteen (twentythirteen): version 2.0 by the WordPress team

### Must Use Plugins (3) ###

Endurance Browser Cache: version 0.4 by Mike Hansen
Endurance Page Cache: version 1.1 by Mike Hansen
Health Check Disable Plugins: No version or author information available

### Active Plugins (1) ###

Health Check: version 0.6.0 by The www.remarpro.com community

### Inactive Plugins (4) ###

Akismet Anti-Spam: version 4.0.1 by Automattic
Contact Form 7: version 4.9.1 by Takayuki Miyoshi
UpdraftPlus - Backup/Restore: version 1.13.15 by UpdraftPlus.Com, DavidAnderson
Yoast SEO: version 5.8 by Team Yoast

### Server ###

Server architecture: Linux 3.12.74-216.ELK6.x86_64 x86_64
PHP Version: 5.4.45 (Supports 64bit values)
PHP SAPI: cgi-fcgi
PHP max input variables: 1000
PHP time limit: 30
PHP memory limit: 256M
Upload max filesize: 64M
PHP post max size: 64M
cURL Version: 7.19.7 NSS/3.27.1
SUHOSIN installed: No
Is the Imagick library available: Yes

### Database ###

Extension: mysql
Server version: 5.5.51-38.2
Client version: 5.5.51
Database prefix: wp_

### WordPress constants ###

ABSPATH: /home4/paulparsons/public_html/
WP_HOME: Undefined
WP_SITEURL: Undefined
WP_DEBUG: Disabled
WP_MAX_MEMORY_LIMIT: 256M
WP_DEBUG_DISPLAY: Enabled
WP_DEBUG_LOG: Disabled
SCRIPT_DEBUG: Disabled
WP_CACHE: Disabled
CONCATENATE_SCRIPTS: Undefined
COMPRESS_SCRIPTS: Undefined
COMPRESS_CSS: Undefined
WP_LOCAL_DEV: Undefined

### Filesystem permissions ###

The main WordPress directory: Writable
The wp-content directory: Writable
The uploads directory: Writable
The plugins directory: Writable
The themes directory: Writable
The Must Use Plugins directory: Writable