This article was written for Page Builder Sandwich 5 or earlier. Page Builder Sandwich 6 is a new block builder, so some steps and screens here may differ. Getting started with version 6
NextGen
There was a previous problem regarding NextGen and Page Builder Sandwich.
Prior to version 2.12, PBS somehow triggered NextGen to show an error message that made your site get a blank white screen. This has been fixed as of version 2.12, so if you’re using an older version, please update.