Neither a CTRL-click nor a right-click on any User-defined Controls button brings up the edit panel/window. Error log shows nothing but the following
29-Feb-2016 16:41:33 > CIVMain.ConfigCmd_Click
29-Feb-2016 16:41:33 > CIVConfig.Form_Paint
Other CTRL-click functionality okay, e.g. CTRL-Help or CTRL-n to display or edit memory notes.
Have rebooted PC and restarted Commander; have restored Commander from Launcher "Restore" with no success.