[NAME] I know this is an older post, but did you ever get a resolution on this?  I'm having similar issues with the exact same setup by the looks of it. Latitude 5420, WD19, Dell 24" monitors, Display Port cables direct to monitor from dock, one screen becomes fuzzy, moves if you move the cable (replaced cable and swapped dock, same issue). I have updated drivers, updated BIOS, swapped the docking station, replaced cables, any thoughts? Update=Resolved-This seems to have been resolved with the addition of the drivers for the monitors.
Dear all, I'm having issue with wd19s dock stations. We have replaced 2 laptops last week with new Latitude. And everyday users complaining about external screen display issues. Dock firmware and Laptop drivers up to date. But I couldnt obtain the exact issue on it. Do you have any idea about it?[IMAGE][IMAGE]
Dell Latitude 5420 and Dock WD19S External Display Issues