It sounds like the app (virtualbox itself) is frozen so reassigning... Also note under gnome-shell a frozen app is difficult to move or resize. This is a feature of Wayland and does not indicate a problem with the shell itself.
** Package changed: gnome-shell (Ubuntu) => virtualbox (Ubuntu) -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-shell in Ubuntu. https://bugs.launchpad.net/bugs/1716674 Title: virtualbox crush guest or freeze host screen Status in virtualbox package in Ubuntu: New Bug description: Virtualbox: 5.1.26 (ubuntu package) + VirtualBox 5.1.26 Oracle VM VirtualBox Extension Pack Host: ubuntu 17.10 (default gnomelibgnome-desktop-3-12 3.25.91.1-0ubuntu2) 4.12.0-12-generic AMD Ryzen5 1600 Guest: ubuntu 16.04 + guest addition The application window of the running guest will crash. Or the host OS screen is not updated. (The mouse pointer responds.) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/virtualbox/+bug/1716674/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp

