Including all the security fixes revealed as part of “April 2017 Oracle CPU”, the VirtualBox 5.1.20 and VirtualBox 5.0.38 releases are small bugfix updates that add multiple GUI (Graphical User Interface) improvements, such as a fix for a crash that occurred when attempting to restore the defaults in the Appliance Import dialog. Moreover, VirtualBox now no longer checks if the Extension Pack is at the latest version available when the user attempts to install a new one, makes non-literal shortcuts work correctly on Windows hosts if the keyboard is not captured, and fixes the mini-toolbar in seamless and full-screen modes for X11 hosts.