I have posted a small update to SPJS-Casc.js to fix these issues:

• Added support for autofilling values when using “Autofill subsequent dropdowns when they contain only one valid option.” in DFFS.
• Changed the jQuery variable from $ to spjs.$ to fix a bug with SharePoints internal file “assetpicker.js” as this one kills jQuery.

Get the updated version here

You find the article describing the solution here, and you find the dedicated forum here.

Alexander