another observation

[alphadog]

As for the artifact issue - I finally figured it out. It is reproducible, and does not happen on my second system (work machine has external monitor via displayport)

Open finder, make sure tab bar is visible (view - show tab bar)

Now drag the finder window, but do it from the tab bar. On my other mac, this creates a new finder window from that tab. On a display link machine (either the laptop display, or external) it creates these weird artifacts and no finder window. Basically you are dragging and dropping a tab on the desktop - this moves the whole finder to a new spot on a DL machine. On a non-DL machine you get 2 windows.

My guess is that I may be able to turn off animations and see real finder windows - there is no way to interact or move these artifacts, so i am not sure if they are real or not. The image is a 4" square area - so each artifact is about 1" square.

EDIT - relaunching finder deletes these artifacts.