When I install the Gillion theme to my site with the required plugins everything seems fine. However, once I activate the plugins (Unyson and WPBakery) and use the plugin to edit the theme I have an issue. When I attempt to save my changes by clicking the Save changes button I get a popup which says saving changes and then I get another popup that says bad gateway. Once this happens, the site becomes unresponsive until I delete the Unyson plugin via FTP. (The site is so unresponsive I cannot even access the WP-Admin site to delete/deactivate the plugin). I have uninstalled and reinstalled the theme and the plugins numerous times. Any assistance would be appreciated.
I am running WordPress 4.9.4 with Unyson 2.7.12 and WPBakery Page Builder 5.4.5. I have no other plugins activated.