[p_davis]

Originally Posted by coconino

Select all tasks and then use Reschedule button (toolbar) or shift-cmd-R.

Thanks, but I've tried that. When I do it, ALL the tasks move to the new start date, except the first one that extends from the old start date to the new one. They do not keep their relative position.

Also, I can't seem to reschedule backwards - a date previous to the original start date.