Re-synchronizing BigPicture's Program will rebuild its structure. It can be accessed from 'Data' drop-down menu or by double-hitting 'r' on a keyboard. This functionality, whenever trigged once again pulls all Tasks to the Gantt chart based on information gathered on Boards which belong to the Program and completely rebuilds Gantt's WBS. In larger projects and Programs this may be a bit time and memory consuming, therefore, should be used once our Program parts do not synchronize correctly or seem to be out of place. Sometimes a simple browser Refresh (F5 or Ctrl+R) should do the trick.