id summary reporter owner description type status component version resolution keywords cc guest host 18742 Left and right modifier keys mirrored on Mac OS X 10.14.5 (Mojave) as host Lars "Repro steps: 1. Connect external keyboard 2. Under System Preferences --> Keyboard --> Keyboard --> Modifier Keys Change option to command and command to option 3. Start VirtualBox 4. Under Preferences --> Input --> Virtual Machine Set ""Host Key Combination"" press command + option to the left Note: it says right command + right option Impact: on Windows guest running a non US keyboard, e.g. Swedish layout, the option key is now alt gr and not alt Same thing on 5.2.30 Might be something in Mac OS which also affect Emacs: http://emacs.1067599.n8.nabble.com/bug-34984-ns-right-command-modifier-has-influence-to-left-td478781.html" defect new other VirtualBox 6.0.8 Windows Mac OS X