The first sheet that is created in Plan & Profile Generator is too short. It does not use the Length that I defined on the Main Tab. All subsequent sheets are the correct length.
For example, my Start Station is 10+100 and my Length is set to 500. When I create the sheets, the first sheet is cut from 10+100 to 10+500 - a distance of only 400. The next sheet is from 10+500 to 11+000 - a distance of 500, which is correct.
This is occurring as a result of the Station Lock being enabled. In the InRoads Explorer, go to Tools>Locks and toggle off "Station".