Some users have reported that after installing macOS 11.1, our UD-ULTC4K USB-C Triple 4K Display Docking Station may not be correctly detected by Apple’s M1 based computers on restart or when powered on after being turned off. This affects the UD-ULTC4K docking station and connected USB 2.0 and 3.0 devices, including the two DisplayPort outputs controlled by the DisplayLink USB Graphics chipset, the HDMI 4K output and connected display will most likely be functional after reboot.
We have had similar reports from users with our UD-3900PDZ USB-C Triple HDMI Docking Station and Apple M1 Mac mini computers, at this time Apple's M1 MacBooks do not appear to be affected.
Until Apple issues an update that resolves this detection issue we recommend unplugging the docking station from the computer, then reconnecting it after macOS has completed loading. If the suggested unplug/reconnect of the dock does not help, power off the M1 system for 60-90 seconds and try connecting the dock again after logging back in. We are hopeful this will be resolved by an update to macOS but do not have a timeline for such a resolution. As of macOS 11.4 this issue is still present.