Hi @fastnetwebs,
I’m not sure which version, the theme and X shortcode are quite old. I recommend restoring your entire site to when it’s still working. So the database could be restored too instead of just files.
It could be multiple conflicts and I can’t provide any further information since we have to narrow down possible causes by updating them or restoring them for compatibilities.
Yes, you can update the theme manually. Please check this https://theme.co/apex/forum/t/setup-updating-your-themes-and-plugins/62 (Manual Updates). And you should do that in staging for testing and possible issue fixes. I recommend contacting a webmaster or developer for that as it’s coming from quite old versions and may require strict attention. Even if I do update it, I can’t fix the issues due to feature gap as this is more on site maintenance and we can’t do that here in the forum.
But if you just wish to find out about that checkout editor plugin then I recommend just restoring your site back to when it’s still working. Still, we can’t fix the conflict between the theme and your plugin here in the forum if there is any, but we could add it to our issue tracker along the information we can find.
Thanks!