I’m not sure about the redirect that @Rad mentioned because those URLs doesn’t redirect to the home page also. And, only your home page has the issue. I could open the rest of your pages in Cornerstone and they work fine.
I get this 500 error in the console when viewing your frontpage in Cornerstone. Your host will be able to help you trace this error. We understand that this happened after the update but this issue is also connected to your web host. I tried creating a new page and set it as your frontpage but the issue still persist.
There might have been some server security rules, most probably in ModSecurity, that prevents the home page from being opened in Cornerstone.
Would you mind trying completely uninstalling W3 Total Cache first? You have uninstalled it under Plugins but it needs complete removal because it leaves a wp-config setting, htaccess rules and files and folders.
Regarding the issue allincorporated.ca, the Topbar really does not support shortcodes. You probably have copied an old code which does not work anymore or inserted a custom code in your child theme’s functions.php and switched to the parent theme.
If you have other issues, please open a separate thread for each in order to avoid confusion and it will also help us focus on one issue at a time.