I too have had a lot of problems with SB dock, which seems to work very well on a Surface Pro 4. It has been very difficult to get the dock to work with multiple screens. For example, I have not been able to get both mini display ports to work at the same time nor have i been able to get all the USB ports to work at the same time. In order to get two monitors, neither are 4K, to work with the SB docking station I had to use a USB to DVI connector and a mini display to DVI connector. This allowed both displays to work. However, the additional USB ports on the docking station did not work. In fact if i had anything else plugged into the USB ports the monitors didn't work. My work around was to have the two monitors attached as described above and the additional items attached to the USB ports on the SB.