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.
Sorry to hear of the problem you are having.
Please make sure you are using latest version of PHP on your server by referring the information provided in the following page.
Also please try to resolve bad gateway error by using the solutions posted on the following pages.