It depends upon whether you have updated the task from Sept 2014 or not. If your tasks are auto scheduled, constrained with no constraint other than ASAP, and do not have an actual start date, then changing the start date of the project should change the dates for all tasks.
If you have set Actual Start dates then you will get a message from Project about tasks before a Project start date when you try to move the start date.
Have you entered progress against any tasks? I'm guessing you have negotiated a new baseline?
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