Caching & Minify Plugins (W3 Total Cache, WP Super Cache, Comet Cache, Better WordPress Minify, etc)
Page Builder Sandwich works with all caching plugins. However, you might encounter some problems if you turn on their minify or caching functionality.
Just make sure that minify is disabled for logged in users, and it should work fine.
We're only showing W3 Total Cache settings here, but other caching & minify plugins should also have similar settings.
W3 Total Cache
Make sure that Don't cache pages for logged in users is checked under Performance > Page Cache
If you're using minify, make sure that Disable minify for logged in users is checked under Performance > Minify