id,summary,reporter,owner,description,type,status,component,version,resolution,keywords,cc,guest,host
16332,Guest Windows 10 displays black desktop on second screen,Peak Zhang,,"My Virtualbox is installed in laptop, OS is windows 10, I also install a guest windows 10 to do some other tasks. I have a second screen connected to laptop and the guest windows 10 is displayed on second screen. 

If I don't shutdown/save the guest windows 10 then unplug in the second screen and then plugin second screen again:

1. The guest windows 10 will display a black desktop after I run mstsc on guest windows(even I closed mstsc). If I press Windows key on keyboard, Start menu and taskbar can be displayed on guest, but the desktop is still black. After the Start Menu and taskbar is hidden, all desktop is black again. To show the desktop, I write a bat file to restart explorer.exe, press Windows key + R to run the bat file, then the desktop can be displayed.

2. The virtualbox min bar will be displayed on first screen of laptop

My VirtualBox version is 5.1.12r112440(Qt5.6.2)
Host and Guest are latest Windows 10
Extention is installed on host, guest additional is install on guest and 3D support is open",defect,new,other,VirtualBox 5.1.12,,,,Windows,Windows