Hi. I found your post describing the same issue (https://kriesi.at/support/topic/drag-and-drop-function-for-reorganizing-gallery-not-functioning/) and after switching from Chrome browser to IE, I was able to drag and drop. My Chrome browser is up to date (Version 44.0.2403.125 m), and so is my WP and Enfold versions.
Hi laptophobo!
can you provide us admin so we can take a look into it? post login details here as private reply.
Cheers!
Andy