Google Chrome Show bookmarks bar greyed out

When the option to show/unshow the bookmark bar in Chrome is greyed out (on Windows), run REGEDIT, and delete the key ‘ComputerHKEY_LOCAL_MACHINESOFTWAREPoliciesGoogleChromeBookmarkEnabled’. Restart chrome and then you can use the key combo CTRL-SHIFT-B to show or unshow the bookmark bar.