Hi Alex,
I manage a digital agency and we have a large number of sites that we use SiteOrigin Builder on, and after the last plugin update, all of them experience the same issue that Ronald has reported in the issue here: https://siteorigin.com/thread/plugin-conflict-4/
In addition to that, all “SiteOrigin Editor” widgets on a page with background colors have changed to black. You can see an example here: http://trailswest.montanawebservices.com/2-10-home-owner-warranty/
The editor boxes on this page have background colors and opacity of 50 set and since the update have turned to this.
Hopefully, this can help identify the issue. Thanks!
Gerrick