Conflict with Page Builder by SiteOrigin

I’m currently developing several sites locally using multisite, and after the most recent WordPress update, my site that’s running both the Sydney theme + Page Builder is completely broken. Nothing on the site, or the admin page come up, and using ‘view source’ there’s no code.

I’m using Sydney on other sites without Page Builder, and those are fine. I’m also using Page Builder on other sites without Sydney and those are fine. So it’s almost certainly a conflict between Sydney and Page Builder.

I re-downloaded both Page Builder AND Sydney to have fresh installs and make sure I hadn’t screwed anything up, and there’s still a conflict.