Upfront editor won't load when attempting to edit Parrot

Hi,

Recently I've been experiencing some issues when attempting to launch the Upfront editor to edit the Parrot theme. When doing so, I end up getting stuck on the loading screen for an excess of 25 minutes upwards.

So far I have attempted to re-install the theme, clear my browser cache to ensure that there are not any issues with my browser as well as attempting to use other browsers and have also cleared the site and CDN cache.

After browsing through other support tickets, I have noticed that it is often questioned if sites use Varnish caching as that can sometimes be the cause of problems. I can confirm that my site uses this.

I have granted access to the site in advance in attempt to speed up the process.

Thanks,
Sam.