There is a known bug known bug related to a graphics driver issue that we are investigating. The bug leads to a state where the VM screen appears black.
Steps to fix:
1. Click bottom left corner to open the Windows start menu (you can't see the button unfortunately but it is there)
2. Search for PowerShell
3. Right click, open as Administrator
4. Type taskkill /f /im dwm.exe
Note: to run PowerShell as administrator, right click on the PowerShell icon and click Run as administrator. Screenshot of the steps: