I have a surface pro 3 and the ud3900 with two displays ( one connected direct to surface dock thru mini DSP, second is DVI thru ud3900) First couple of days things worked well but today I noticed some serious lag in the display with switching windows and internet loads. I disconnected the ud3900, restarted the surface and things were normal again.
Looking through the forms I saw the clean tool and the newest driver (7.7). ran the cleaner, loaded the driver, restarted the surface, cycled pwr on the ud3900 then plugged the usb3 back in. Display looked much better and more responsive, but now I have no internet. I am able to open network drives and outlook, but neither chrome or IE will connect, just states that the page cannot be displayed.
Surface Pro 3 with dock
Surface dock to monitor 1 with mini DSP
Surface dock USB3 to UD3900 with DVI to monitor 2
appreciate any help