After all of this that has been going on. For ME at least - with our ADS-1800W, our problem has been resolved by the Brother Full Driver & Software update (D1) released this past week. I can scan from PC & PULL documents, I can PUSH from the device screen to the PC (multiple PCs are now registered correctly & I can select what device to scan to).
I didn't have to do anything other than uninstall all the old software & install the new version - which is the way is SHOULD work without any extra driver changes, "Scan To" registrations, etc.
IMO - at least for us here - my issue was a brother software issue & they needed to fix the problem.
Now - I can get back to work.