I would doublecheck a few things. Make sure all tasks are set to auto schedule rather than manually scheduled (task menu). There is also a global setting where you can set all new tasks to auto schedule. The manual scheduling setting basically takes the logic functionality out of the tool. I would also make sure all tasks have the constraint type set to “As Soon As Possible”. If there are other constraints, they can also stop your logic from working. Is there any status on the tasks? If actual start and finish dates are entered, that will force the dates to what is entered in the Actual Start/Finish column. If none of that works, make sure there are no predecessors and successors on the summary tasks. If there is a predecessor on the summary task, it will force all of the sub tasks to comply with that predecessor relationship which would make all tasks potentially start on the same date, pending any other predecessors the sub tasks may have. Good luck!