DDJ-RB headphones not working; [System Extension Blocked] message also not showing up

Hey everyone, 

I recently downloaded rekordbox to use with my DDJ-RBs however have gotten to the point where the headphone audio ceased to work.

After following Pioneer's instruction of downloading the most current driver (and uninstalling it if doesn't initially work) I'm still not having the [System Extension Blocked] message pop up for me.

It seems this is a common issue without an answer as yet. I have uninstalled and reinstalled the driver at least 10 times with still no luck.

Just thought I'd try here as my last effort for a solution