Hey @MorganaG,
Thanks you for giving us access to your site. I went to Dashboard > Updates and an update for X is available. I went ahead and updated X so I could test if the cause of the issue is version incompatibility and the result is, it’s not the cause. More details below.
Next time though, please check the Updates page. If no updates are available, click on the Check Again button to double check.
I checked the console and I see Javascript errors coming from third-party plugins like AddThis and Autoptimize.
Please deactivate those plugins and see if Cornerstone loads. If it does load, forward this issue to the developers of those plugins.
Just note that I’m not saying that you should not use those plugins especially Autoptimize which is a useful tool to optimize a website. What I’m saying is, issues caused by third-party plugins should be fixed by their authors and third-party plugins should be configured correctly. We do not offer those services as part of our product support so you should reach out to the plugin authors or hire a developer.
Regarding uninstalling Cornerstone, yes, that will break the frontend of your site. What Rad was suggesting is temporary though. If the site could not be taken down temporarily, you should consider copying your site to a staging server for testing and debugging purposes.
Thanks.