If you have multiple monitors, and are running Windows 10 v1903 on your local (host) computer, and are connecting to other Windows 10 machines (regardless of version) via Remote Desktop, you may well have experienced the rather annoying mouse “jump” or “bump” as you pass your cursor across the boundaries of the 2, 3, 4 monitors. This problem also manifests itself on occasion as a black box that “sticks” to your cursor and follows it around the screen, blocking out whatever it is you hover over, making it incredibly difficult to continue using.
This is caused by the change v1903 to RDP’s default Graphics Driver used for RDP sessions wo WDDM, prior to 1903 this was XDDM (thanks for the upgrade Microsoft)
To work around this issue, set the following GPO to Disabled on your local (host), and reboot. A gpupdate /force was not sufficient to apply this setting.
“Use WDDM graphics display driver for Remote Desktop Connections” > DISABLED
Configuration > Administrative Templates > Windows Components > Remote Desktop Services > Remote Desktop Session Host > Remote Session Environment
As a side note, you may receive a protocol error if you try to open any previously saved RDP files that have the dispaly setting “Visual Styles” ticked. This is a WDDM feature, and needs to be un-ticked for the RDP file to be used.