RC5
ManageSettings.php
function ModifyModSettings()
I believe this was already fixed in trunk... the second parameter is also not needed as the menu can be edited in the calledback subaction function.
Edit: not quite... Bug #4638: loadGeneralSettingParameters() should be called AFTER integrate_modify_modifications (http://dev.simplemachines.org/mantis/view.php?id=4638)