@muzzstick, you are a genius! I was doing quick scans of these folders to check the permissions, I just glossed over “775”.
With a quick review, It appears the JS errors are gone. I can click “Add Item” and navigate around the MIGX Manager without problems. No more endless “Loading…”!!!
Thank you all for your comments, and thank you @muzzstick for your consistent effort.
The sad part of all of this is, I think the install was supposed to be the easy part. Wish me luck!