Host: surface Pro 4 1TB running Windows 10 Pro x64
Guest: Windows 10 Pro x64
VB: 5.1.2
The mouse stops working. It is though the mouse pad is being ignored. However, pressing Ctrl shows the mouse has moved and restores it for a while.
Note: The mouse works fine on the host.
Also I noticed that the VB additions icon is missing from hidden icons in the guest but it is running according to task manager.
Edit 8/13/2016: If the Surface Pro 4 is in a docking station connected to a KVM switch which has a USB keyboard and mouse the mouse works fine. The problem only occurs when using the Surface Pro 4 standalone with the touchpad.
Edit: Ping