I have a Dell Inspiron 7520 and a Dell D3000 docking station connected through the USB 3.0 port. Before updating to Windows 10 (I was using Windows 7), everything worked fine. Two monitors were connected to the docking station (one through the HDMI and one through the DVI port) and my laptop used all three displays just fine.
After updating to Windows 10, no monitors that are connected through the docking station are detected. The monitors are detected if I plug them directly into the laptop's HDMI or VGA ports. However, other USB devices (e.g. keyboard, mouse) still function properly through the docking station. Only the display monitors seem not to be detected.
I upgraded the driver for the D3000 to the most recent one (here). But this did not help.